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/netdevice.h>
  17 #include <linux/types.h>
  18 #include <linux/list.h>
  19 #include <linux/errno.h>
  20 #include <linux/kernel.h>
  21 #include <linux/sched/signal.h>
  22 #include <linux/slab.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/init.h>
  25 #include <linux/poll.h>
  26 #include <linux/security.h>
  27 #include <net/sock.h>
  28 #include <asm/ebcdic.h>
  29 #include <asm/cpcmd.h>
  30 #include <linux/kmod.h>
  31
  32 #include <net/iucv/af_iucv.h>
  33
  34 #define VERSION "1.2"
  35
  36 static char iucv_userid[80];
  37
  38 static const struct proto_ops iucv_sock_ops;
  39
  40 static struct proto iucv_proto = {
  41         .name           = "AF_IUCV",
  42         .owner          = THIS_MODULE,
  43         .obj_size       = sizeof(struct iucv_sock),
  44 };
  45
  46 static struct iucv_interface *pr_iucv;
  47
  48 /* special AF_IUCV IPRM messages */
  49 static const u8 iprm_shutdown[8] =
  50         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
  51
  52 #define TRGCLS_SIZE     (sizeof(((struct iucv_message *)0)->class))
  53
  54 #define __iucv_sock_wait(sk, condition, timeo, ret)                     \
  55 do {                                                                    \
  56         DEFINE_WAIT(__wait);                                            \
  57         long __timeo = timeo;                                           \
  58         ret = 0;                                                        \
  59         prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE);     \
  60         while (!(condition)) {                                          \
  61                 if (!__timeo) {                                         \
  62                         ret = -EAGAIN;                                  \
  63                         break;                                          \
  64                 }                                                       \
  65                 if (signal_pending(current)) {                          \
  66                         ret = sock_intr_errno(__timeo);                 \
  67                         break;                                          \
  68                 }                                                       \
  69                 release_sock(sk);                                       \
  70                 __timeo = schedule_timeout(__timeo);                    \
  71                 lock_sock(sk);                                          \
  72                 ret = sock_error(sk);                                   \
  73                 if (ret)                                                \
  74                         break;                                          \
  75         }                                                               \
  76         finish_wait(sk_sleep(sk), &__wait);                             \
  77 } while (0)
  78
  79 #define iucv_sock_wait(sk, condition, timeo)                            \
  80 ({                                                                      \
  81         int __ret = 0;                                                  \
  82         if (!(condition))                                               \
  83                 __iucv_sock_wait(sk, condition, timeo, __ret);          \
  84         __ret;                                                          \
  85 })
  86
  87 static void iucv_sock_kill(struct sock *sk);
  88 static void iucv_sock_close(struct sock *sk);
  89 static void iucv_sever_path(struct sock *, int);
  90
  91 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
  92         struct packet_type *pt, struct net_device *orig_dev);
  93 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
  94                    struct sk_buff *skb, u8 flags);
  95 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
  96
  97 /* Call Back functions */
  98 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  99 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
 100 static void iucv_callback_connack(struct iucv_path *, u8 *);
 101 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
 102 static void iucv_callback_connrej(struct iucv_path *, u8 *);
 103 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
 104
 105 static struct iucv_sock_list iucv_sk_list = {
 106         .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
 107         .autobind_name = ATOMIC_INIT(0)
 108 };
 109
 110 static struct iucv_handler af_iucv_handler = {
 111         .path_pending     = iucv_callback_connreq,
 112         .path_complete    = iucv_callback_connack,
 113         .path_severed     = iucv_callback_connrej,
 114         .message_pending  = iucv_callback_rx,
 115         .message_complete = iucv_callback_txdone,
 116         .path_quiesced    = iucv_callback_shutdown,
 117 };
 118
 119 static inline void high_nmcpy(unsigned char *dst, char *src)
 120 {
 121        memcpy(dst, src, 8);
 122 }
 123
 124 static inline void low_nmcpy(unsigned char *dst, char *src)
 125 {
 126        memcpy(&dst[8], src, 8);
 127 }
 128
 129 static int afiucv_pm_prepare(struct device *dev)
 130 {
 131 #ifdef CONFIG_PM_DEBUG
 132         printk(KERN_WARNING "afiucv_pm_prepare\n");
 133 #endif
 134         return 0;
 135 }
 136
 137 static void afiucv_pm_complete(struct device *dev)
 138 {
 139 #ifdef CONFIG_PM_DEBUG
 140         printk(KERN_WARNING "afiucv_pm_complete\n");
 141 #endif
 142 }
 143
 144 /**
 145  * afiucv_pm_freeze() - Freeze PM callback
 146  * @dev:        AFIUCV dummy device
 147  *
 148  * Sever all established IUCV communication pathes
 149  */
 150 static int afiucv_pm_freeze(struct device *dev)
 151 {
 152         struct iucv_sock *iucv;
 153         struct sock *sk;
 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 0;
 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                 err = -ENODEV;
 357                 goto err_free;
 358         }
 359
 360         dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len);
 361
 362         if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
 363                 err = -ENETDOWN;
 364                 goto err_free;
 365         }
 366         if (skb->len > skb->dev->mtu) {
 367                 if (sock->sk_type == SOCK_SEQPACKET) {
 368                         err = -EMSGSIZE;
 369                         goto err_free;
 370                 }
 371                 skb_trim(skb, skb->dev->mtu);
 372         }
 373         skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
 374
 375         __skb_header_release(skb);
 376         nskb = skb_clone(skb, GFP_ATOMIC);
 377         if (!nskb) {
 378                 err = -ENOMEM;
 379                 goto err_free;
 380         }
 381
 382         skb_queue_tail(&iucv->send_skb_q, nskb);
 383         err = dev_queue_xmit(skb);
 384         if (net_xmit_eval(err)) {
 385                 skb_unlink(nskb, &iucv->send_skb_q);
 386                 kfree_skb(nskb);
 387         } else {
 388                 atomic_sub(confirm_recv, &iucv->msg_recv);
 389                 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
 390         }
 391         return net_xmit_eval(err);
 392
 393 err_free:
 394         kfree_skb(skb);
 395         return err;
 396 }
 397
 398 static struct sock *__iucv_get_sock_by_name(char *nm)
 399 {
 400         struct sock *sk;
 401
 402         sk_for_each(sk, &iucv_sk_list.head)
 403                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 404                         return sk;
 405
 406         return NULL;
 407 }
 408
 409 static void iucv_sock_destruct(struct sock *sk)
 410 {
 411         skb_queue_purge(&sk->sk_receive_queue);
 412         skb_queue_purge(&sk->sk_error_queue);
 413
 414         sk_mem_reclaim(sk);
 415
 416         if (!sock_flag(sk, SOCK_DEAD)) {
 417                 pr_err("Attempt to release alive iucv socket %p\n", sk);
 418                 return;
 419         }
 420
 421         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 422         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 423         WARN_ON(sk->sk_wmem_queued);
 424         WARN_ON(sk->sk_forward_alloc);
 425 }
 426
 427 /* Cleanup Listen */
 428 static void iucv_sock_cleanup_listen(struct sock *parent)
 429 {
 430         struct sock *sk;
 431
 432         /* Close non-accepted connections */
 433         while ((sk = iucv_accept_dequeue(parent, NULL))) {
 434                 iucv_sock_close(sk);
 435                 iucv_sock_kill(sk);
 436         }
 437
 438         parent->sk_state = IUCV_CLOSED;
 439 }
 440
 441 /* Kill socket (only if zapped and orphaned) */
 442 static void iucv_sock_kill(struct sock *sk)
 443 {
 444         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 445                 return;
 446
 447         iucv_sock_unlink(&iucv_sk_list, sk);
 448         sock_set_flag(sk, SOCK_DEAD);
 449         sock_put(sk);
 450 }
 451
 452 /* Terminate an IUCV path */
 453 static void iucv_sever_path(struct sock *sk, int with_user_data)
 454 {
 455         unsigned char user_data[16];
 456         struct iucv_sock *iucv = iucv_sk(sk);
 457         struct iucv_path *path = iucv->path;
 458
 459         if (iucv->path) {
 460                 iucv->path = NULL;
 461                 if (with_user_data) {
 462                         low_nmcpy(user_data, iucv->src_name);
 463                         high_nmcpy(user_data, iucv->dst_name);
 464                         ASCEBC(user_data, sizeof(user_data));
 465                         pr_iucv->path_sever(path, user_data);
 466                 } else
 467                         pr_iucv->path_sever(path, NULL);
 468                 iucv_path_free(path);
 469         }
 470 }
 471
 472 /* Send controlling flags through an IUCV socket for HIPER transport */
 473 static int iucv_send_ctrl(struct sock *sk, u8 flags)
 474 {
 475         struct iucv_sock *iucv = iucv_sk(sk);
 476         int err = 0;
 477         int blen;
 478         struct sk_buff *skb;
 479         u8 shutdown = 0;
 480
 481         blen = sizeof(struct af_iucv_trans_hdr) +
 482                LL_RESERVED_SPACE(iucv->hs_dev);
 483         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 484                 /* controlling flags should be sent anyway */
 485                 shutdown = sk->sk_shutdown;
 486                 sk->sk_shutdown &= RCV_SHUTDOWN;
 487         }
 488         skb = sock_alloc_send_skb(sk, blen, 1, &err);
 489         if (skb) {
 490                 skb_reserve(skb, blen);
 491                 err = afiucv_hs_send(NULL, sk, skb, flags);
 492         }
 493         if (shutdown)
 494                 sk->sk_shutdown = shutdown;
 495         return err;
 496 }
 497
 498 /* Close an IUCV socket */
 499 static void iucv_sock_close(struct sock *sk)
 500 {
 501         struct iucv_sock *iucv = iucv_sk(sk);
 502         unsigned long timeo;
 503         int err = 0;
 504
 505         lock_sock(sk);
 506
 507         switch (sk->sk_state) {
 508         case IUCV_LISTEN:
 509                 iucv_sock_cleanup_listen(sk);
 510                 break;
 511
 512         case IUCV_CONNECTED:
 513                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
 514                         err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
 515                         sk->sk_state = IUCV_DISCONN;
 516                         sk->sk_state_change(sk);
 517                 }
 518         case IUCV_DISCONN:   /* fall through */
 519                 sk->sk_state = IUCV_CLOSING;
 520                 sk->sk_state_change(sk);
 521
 522                 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
 523                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 524                                 timeo = sk->sk_lingertime;
 525                         else
 526                                 timeo = IUCV_DISCONN_TIMEOUT;
 527                         iucv_sock_wait(sk,
 528                                         iucv_sock_in_state(sk, IUCV_CLOSED, 0),
 529                                         timeo);
 530                 }
 531
 532         case IUCV_CLOSING:   /* fall through */
 533                 sk->sk_state = IUCV_CLOSED;
 534                 sk->sk_state_change(sk);
 535
 536                 sk->sk_err = ECONNRESET;
 537                 sk->sk_state_change(sk);
 538
 539                 skb_queue_purge(&iucv->send_skb_q);
 540                 skb_queue_purge(&iucv->backlog_skb_q);
 541
 542         default:   /* fall through */
 543                 iucv_sever_path(sk, 1);
 544         }
 545
 546         if (iucv->hs_dev) {
 547                 dev_put(iucv->hs_dev);
 548                 iucv->hs_dev = NULL;
 549                 sk->sk_bound_dev_if = 0;
 550         }
 551
 552         /* mark socket for deletion by iucv_sock_kill() */
 553         sock_set_flag(sk, SOCK_ZAPPED);
 554
 555         release_sock(sk);
 556 }
 557
 558 static void iucv_sock_init(struct sock *sk, struct sock *parent)
 559 {
 560         if (parent) {
 561                 sk->sk_type = parent->sk_type;
 562                 security_sk_clone(parent, sk);
 563         }
 564 }
 565
 566 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
 567 {
 568         struct sock *sk;
 569         struct iucv_sock *iucv;
 570
 571         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
 572         if (!sk)
 573                 return NULL;
 574         iucv = iucv_sk(sk);
 575
 576         sock_init_data(sock, sk);
 577         INIT_LIST_HEAD(&iucv->accept_q);
 578         spin_lock_init(&iucv->accept_q_lock);
 579         skb_queue_head_init(&iucv->send_skb_q);
 580         INIT_LIST_HEAD(&iucv->message_q.list);
 581         spin_lock_init(&iucv->message_q.lock);
 582         skb_queue_head_init(&iucv->backlog_skb_q);
 583         iucv->send_tag = 0;
 584         atomic_set(&iucv->pendings, 0);
 585         iucv->flags = 0;
 586         iucv->msglimit = 0;
 587         atomic_set(&iucv->msg_sent, 0);
 588         atomic_set(&iucv->msg_recv, 0);
 589         iucv->path = NULL;
 590         iucv->sk_txnotify = afiucv_hs_callback_txnotify;
 591         memset(&iucv->src_user_id , 0, 32);
 592         if (pr_iucv)
 593                 iucv->transport = AF_IUCV_TRANS_IUCV;
 594         else
 595                 iucv->transport = AF_IUCV_TRANS_HIPER;
 596
 597         sk->sk_destruct = iucv_sock_destruct;
 598         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 599         sk->sk_allocation = GFP_DMA;
 600
 601         sock_reset_flag(sk, SOCK_ZAPPED);
 602
 603         sk->sk_protocol = proto;
 604         sk->sk_state    = IUCV_OPEN;
 605
 606         iucv_sock_link(&iucv_sk_list, sk);
 607         return sk;
 608 }
 609
 610 /* Create an IUCV socket */
 611 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
 612                             int kern)
 613 {
 614         struct sock *sk;
 615
 616         if (protocol && protocol != PF_IUCV)
 617                 return -EPROTONOSUPPORT;
 618
 619         sock->state = SS_UNCONNECTED;
 620
 621         switch (sock->type) {
 622         case SOCK_STREAM:
 623                 sock->ops = &iucv_sock_ops;
 624                 break;
 625         case SOCK_SEQPACKET:
 626                 /* currently, proto ops can handle both sk types */
 627                 sock->ops = &iucv_sock_ops;
 628                 break;
 629         default:
 630                 return -ESOCKTNOSUPPORT;
 631         }
 632
 633         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
 634         if (!sk)
 635                 return -ENOMEM;
 636
 637         iucv_sock_init(sk, NULL);
 638
 639         return 0;
 640 }
 641
 642 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 643 {
 644         write_lock_bh(&l->lock);
 645         sk_add_node(sk, &l->head);
 646         write_unlock_bh(&l->lock);
 647 }
 648
 649 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 650 {
 651         write_lock_bh(&l->lock);
 652         sk_del_node_init(sk);
 653         write_unlock_bh(&l->lock);
 654 }
 655
 656 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 657 {
 658         unsigned long flags;
 659         struct iucv_sock *par = iucv_sk(parent);
 660
 661         sock_hold(sk);
 662         spin_lock_irqsave(&par->accept_q_lock, flags);
 663         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 664         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 665         iucv_sk(sk)->parent = parent;
 666         sk_acceptq_added(parent);
 667 }
 668
 669 void iucv_accept_unlink(struct sock *sk)
 670 {
 671         unsigned long flags;
 672         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 673
 674         spin_lock_irqsave(&par->accept_q_lock, flags);
 675         list_del_init(&iucv_sk(sk)->accept_q);
 676         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 677         sk_acceptq_removed(iucv_sk(sk)->parent);
 678         iucv_sk(sk)->parent = NULL;
 679         sock_put(sk);
 680 }
 681
 682 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 683 {
 684         struct iucv_sock *isk, *n;
 685         struct sock *sk;
 686
 687         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 688                 sk = (struct sock *) isk;
 689                 lock_sock(sk);
 690
 691                 if (sk->sk_state == IUCV_CLOSED) {
 692                         iucv_accept_unlink(sk);
 693                         release_sock(sk);
 694                         continue;
 695                 }
 696
 697                 if (sk->sk_state == IUCV_CONNECTED ||
 698                     sk->sk_state == IUCV_DISCONN ||
 699                     !newsock) {
 700                         iucv_accept_unlink(sk);
 701                         if (newsock)
 702                                 sock_graft(sk, newsock);
 703
 704                         release_sock(sk);
 705                         return sk;
 706                 }
 707
 708                 release_sock(sk);
 709         }
 710         return NULL;
 711 }
 712
 713 static void __iucv_auto_name(struct iucv_sock *iucv)
 714 {
 715         char name[12];
 716
 717         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 718         while (__iucv_get_sock_by_name(name)) {
 719                 sprintf(name, "%08x",
 720                         atomic_inc_return(&iucv_sk_list.autobind_name));
 721         }
 722         memcpy(iucv->src_name, name, 8);
 723 }
 724
 725 /* Bind an unbound socket */
 726 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 727                           int addr_len)
 728 {
 729         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 730         struct sock *sk = sock->sk;
 731         struct iucv_sock *iucv;
 732         int err = 0;
 733         struct net_device *dev;
 734         char uid[9];
 735
 736         /* Verify the input sockaddr */
 737         if (addr_len < sizeof(struct sockaddr_iucv) ||
 738             addr->sa_family != AF_IUCV)
 739                 return -EINVAL;
 740
 741         lock_sock(sk);
 742         if (sk->sk_state != IUCV_OPEN) {
 743                 err = -EBADFD;
 744                 goto done;
 745         }
 746
 747         write_lock_bh(&iucv_sk_list.lock);
 748
 749         iucv = iucv_sk(sk);
 750         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 751                 err = -EADDRINUSE;
 752                 goto done_unlock;
 753         }
 754         if (iucv->path)
 755                 goto done_unlock;
 756
 757         /* Bind the socket */
 758         if (pr_iucv)
 759                 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
 760                         goto vm_bind; /* VM IUCV transport */
 761
 762         /* try hiper transport */
 763         memcpy(uid, sa->siucv_user_id, sizeof(uid));
 764         ASCEBC(uid, 8);
 765         rcu_read_lock();
 766         for_each_netdev_rcu(&init_net, dev) {
 767                 if (!memcmp(dev->perm_addr, uid, 8)) {
 768                         memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
 769                         /* Check for unitialized siucv_name */
 770                         if (strncmp(sa->siucv_name, "        ", 8) == 0)
 771                                 __iucv_auto_name(iucv);
 772                         else
 773                                 memcpy(iucv->src_name, sa->siucv_name, 8);
 774                         sk->sk_bound_dev_if = dev->ifindex;
 775                         iucv->hs_dev = dev;
 776                         dev_hold(dev);
 777                         sk->sk_state = IUCV_BOUND;
 778                         iucv->transport = AF_IUCV_TRANS_HIPER;
 779                         if (!iucv->msglimit)
 780                                 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
 781                         rcu_read_unlock();
 782                         goto done_unlock;
 783                 }
 784         }
 785         rcu_read_unlock();
 786 vm_bind:
 787         if (pr_iucv) {
 788                 /* use local userid for backward compat */
 789                 memcpy(iucv->src_name, sa->siucv_name, 8);
 790                 memcpy(iucv->src_user_id, iucv_userid, 8);
 791                 sk->sk_state = IUCV_BOUND;
 792                 iucv->transport = AF_IUCV_TRANS_IUCV;
 793                 if (!iucv->msglimit)
 794                         iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 795                 goto done_unlock;
 796         }
 797         /* found no dev to bind */
 798         err = -ENODEV;
 799 done_unlock:
 800         /* Release the socket list lock */
 801         write_unlock_bh(&iucv_sk_list.lock);
 802 done:
 803         release_sock(sk);
 804         return err;
 805 }
 806
 807 /* Automatically bind an unbound socket */
 808 static int iucv_sock_autobind(struct sock *sk)
 809 {
 810         struct iucv_sock *iucv = iucv_sk(sk);
 811         int err = 0;
 812
 813         if (unlikely(!pr_iucv))
 814                 return -EPROTO;
 815
 816         memcpy(iucv->src_user_id, iucv_userid, 8);
 817
 818         write_lock_bh(&iucv_sk_list.lock);
 819         __iucv_auto_name(iucv);
 820         write_unlock_bh(&iucv_sk_list.lock);
 821
 822         if (!iucv->msglimit)
 823                 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 824
 825         return err;
 826 }
 827
 828 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
 829 {
 830         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 831         struct sock *sk = sock->sk;
 832         struct iucv_sock *iucv = iucv_sk(sk);
 833         unsigned char user_data[16];
 834         int err;
 835
 836         high_nmcpy(user_data, sa->siucv_name);
 837         low_nmcpy(user_data, iucv->src_name);
 838         ASCEBC(user_data, sizeof(user_data));
 839
 840         /* Create path. */
 841         iucv->path = iucv_path_alloc(iucv->msglimit,
 842                                      IUCV_IPRMDATA, GFP_KERNEL);
 843         if (!iucv->path) {
 844                 err = -ENOMEM;
 845                 goto done;
 846         }
 847         err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
 848                                     sa->siucv_user_id, NULL, user_data,
 849                                     sk);
 850         if (err) {
 851                 iucv_path_free(iucv->path);
 852                 iucv->path = NULL;
 853                 switch (err) {
 854                 case 0x0b:      /* Target communicator is not logged on */
 855                         err = -ENETUNREACH;
 856                         break;
 857                 case 0x0d:      /* Max connections for this guest exceeded */
 858                 case 0x0e:      /* Max connections for target guest exceeded */
 859                         err = -EAGAIN;
 860                         break;
 861                 case 0x0f:      /* Missing IUCV authorization */
 862                         err = -EACCES;
 863                         break;
 864                 default:
 865                         err = -ECONNREFUSED;
 866                         break;
 867                 }
 868         }
 869 done:
 870         return err;
 871 }
 872
 873 /* Connect an unconnected socket */
 874 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 875                              int alen, int flags)
 876 {
 877         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 878         struct sock *sk = sock->sk;
 879         struct iucv_sock *iucv = iucv_sk(sk);
 880         int err;
 881
 882         if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
 883                 return -EINVAL;
 884
 885         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 886                 return -EBADFD;
 887
 888         if (sk->sk_state == IUCV_OPEN &&
 889             iucv->transport == AF_IUCV_TRANS_HIPER)
 890                 return -EBADFD; /* explicit bind required */
 891
 892         if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
 893                 return -EINVAL;
 894
 895         if (sk->sk_state == IUCV_OPEN) {
 896                 err = iucv_sock_autobind(sk);
 897                 if (unlikely(err))
 898                         return err;
 899         }
 900
 901         lock_sock(sk);
 902
 903         /* Set the destination information */
 904         memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
 905         memcpy(iucv->dst_name, sa->siucv_name, 8);
 906
 907         if (iucv->transport == AF_IUCV_TRANS_HIPER)
 908                 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
 909         else
 910                 err = afiucv_path_connect(sock, addr);
 911         if (err)
 912                 goto done;
 913
 914         if (sk->sk_state != IUCV_CONNECTED)
 915                 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
 916                                                             IUCV_DISCONN),
 917                                      sock_sndtimeo(sk, flags & O_NONBLOCK));
 918
 919         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
 920                 err = -ECONNREFUSED;
 921
 922         if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
 923                 iucv_sever_path(sk, 0);
 924
 925 done:
 926         release_sock(sk);
 927         return err;
 928 }
 929
 930 /* Move a socket into listening state. */
 931 static int iucv_sock_listen(struct socket *sock, int backlog)
 932 {
 933         struct sock *sk = sock->sk;
 934         int err;
 935
 936         lock_sock(sk);
 937
 938         err = -EINVAL;
 939         if (sk->sk_state != IUCV_BOUND)
 940                 goto done;
 941
 942         if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
 943                 goto done;
 944
 945         sk->sk_max_ack_backlog = backlog;
 946         sk->sk_ack_backlog = 0;
 947         sk->sk_state = IUCV_LISTEN;
 948         err = 0;
 949
 950 done:
 951         release_sock(sk);
 952         return err;
 953 }
 954
 955 /* Accept a pending connection */
 956 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 957                             int flags, bool kern)
 958 {
 959         DECLARE_WAITQUEUE(wait, current);
 960         struct sock *sk = sock->sk, *nsk;
 961         long timeo;
 962         int err = 0;
 963
 964         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 965
 966         if (sk->sk_state != IUCV_LISTEN) {
 967                 err = -EBADFD;
 968                 goto done;
 969         }
 970
 971         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 972
 973         /* Wait for an incoming connection */
 974         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 975         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 976                 set_current_state(TASK_INTERRUPTIBLE);
 977                 if (!timeo) {
 978                         err = -EAGAIN;
 979                         break;
 980                 }
 981
 982                 release_sock(sk);
 983                 timeo = schedule_timeout(timeo);
 984                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 985
 986                 if (sk->sk_state != IUCV_LISTEN) {
 987                         err = -EBADFD;
 988                         break;
 989                 }
 990
 991                 if (signal_pending(current)) {
 992                         err = sock_intr_errno(timeo);
 993                         break;
 994                 }
 995         }
 996
 997         set_current_state(TASK_RUNNING);
 998         remove_wait_queue(sk_sleep(sk), &wait);
 999
1000         if (err)
1001                 goto done;
1002
1003         newsock->state = SS_CONNECTED;
1004
1005 done:
1006         release_sock(sk);
1007         return err;
1008 }
1009
1010 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
1011                              int peer)
1012 {
1013         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
1014         struct sock *sk = sock->sk;
1015         struct iucv_sock *iucv = iucv_sk(sk);
1016
1017         addr->sa_family = AF_IUCV;
1018
1019         if (peer) {
1020                 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1021                 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1022         } else {
1023                 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1024                 memcpy(siucv->siucv_name, iucv->src_name, 8);
1025         }
1026         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1027         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1028         memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1029
1030         return sizeof(struct sockaddr_iucv);
1031 }
1032
1033 /**
1034  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1035  * @path:       IUCV path
1036  * @msg:        Pointer to a struct iucv_message
1037  * @skb:        The socket data to send, skb->len MUST BE <= 7
1038  *
1039  * Send the socket data in the parameter list in the iucv message
1040  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1041  * list and the socket data len at index 7 (last byte).
1042  * See also iucv_msg_length().
1043  *
1044  * Returns the error code from the iucv_message_send() call.
1045  */
1046 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1047                           struct sk_buff *skb)
1048 {
1049         u8 prmdata[8];
1050
1051         memcpy(prmdata, (void *) skb->data, skb->len);
1052         prmdata[7] = 0xff - (u8) skb->len;
1053         return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1054                                  (void *) prmdata, 8);
1055 }
1056
1057 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1058                              size_t len)
1059 {
1060         struct sock *sk = sock->sk;
1061         struct iucv_sock *iucv = iucv_sk(sk);
1062         size_t headroom = 0;
1063         size_t linear;
1064         struct sk_buff *skb;
1065         struct iucv_message txmsg = {0};
1066         struct cmsghdr *cmsg;
1067         int cmsg_done;
1068         long timeo;
1069         char user_id[9];
1070         char appl_id[9];
1071         int err;
1072         int noblock = msg->msg_flags & MSG_DONTWAIT;
1073
1074         err = sock_error(sk);
1075         if (err)
1076                 return err;
1077
1078         if (msg->msg_flags & MSG_OOB)
1079                 return -EOPNOTSUPP;
1080
1081         /* SOCK_SEQPACKET: we do not support segmented records */
1082         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1083                 return -EOPNOTSUPP;
1084
1085         lock_sock(sk);
1086
1087         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1088                 err = -EPIPE;
1089                 goto out;
1090         }
1091
1092         /* Return if the socket is not in connected state */
1093         if (sk->sk_state != IUCV_CONNECTED) {
1094                 err = -ENOTCONN;
1095                 goto out;
1096         }
1097
1098         /* initialize defaults */
1099         cmsg_done   = 0;        /* check for duplicate headers */
1100         txmsg.class = 0;
1101
1102         /* iterate over control messages */
1103         for_each_cmsghdr(cmsg, msg) {
1104                 if (!CMSG_OK(msg, cmsg)) {
1105                         err = -EINVAL;
1106                         goto out;
1107                 }
1108
1109                 if (cmsg->cmsg_level != SOL_IUCV)
1110                         continue;
1111
1112                 if (cmsg->cmsg_type & cmsg_done) {
1113                         err = -EINVAL;
1114                         goto out;
1115                 }
1116                 cmsg_done |= cmsg->cmsg_type;
1117
1118                 switch (cmsg->cmsg_type) {
1119                 case SCM_IUCV_TRGCLS:
1120                         if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1121                                 err = -EINVAL;
1122                                 goto out;
1123                         }
1124
1125                         /* set iucv message target class */
1126                         memcpy(&txmsg.class,
1127                                 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1128
1129                         break;
1130
1131                 default:
1132                         err = -EINVAL;
1133                         goto out;
1134                 }
1135         }
1136
1137         /* allocate one skb for each iucv message:
1138          * this is fine for SOCK_SEQPACKET (unless we want to support
1139          * segmented records using the MSG_EOR flag), but
1140          * for SOCK_STREAM we might want to improve it in future */
1141         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1142                 headroom = sizeof(struct af_iucv_trans_hdr) +
1143                            LL_RESERVED_SPACE(iucv->hs_dev);
1144                 linear = len;
1145         } else {
1146                 if (len < PAGE_SIZE) {
1147                         linear = len;
1148                 } else {
1149                         /* In nonlinear "classic" iucv skb,
1150                          * reserve space for iucv_array
1151                          */
1152                         headroom = sizeof(struct iucv_array) *
1153                                    (MAX_SKB_FRAGS + 1);
1154                         linear = PAGE_SIZE - headroom;
1155                 }
1156         }
1157         skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1158                                    noblock, &err, 0);
1159         if (!skb)
1160                 goto out;
1161         if (headroom)
1162                 skb_reserve(skb, headroom);
1163         skb_put(skb, linear);
1164         skb->len = len;
1165         skb->data_len = len - linear;
1166         err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1167         if (err)
1168                 goto fail;
1169
1170         /* wait if outstanding messages for iucv path has reached */
1171         timeo = sock_sndtimeo(sk, noblock);
1172         err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1173         if (err)
1174                 goto fail;
1175
1176         /* return -ECONNRESET if the socket is no longer connected */
1177         if (sk->sk_state != IUCV_CONNECTED) {
1178                 err = -ECONNRESET;
1179                 goto fail;
1180         }
1181
1182         /* increment and save iucv message tag for msg_completion cbk */
1183         txmsg.tag = iucv->send_tag++;
1184         IUCV_SKB_CB(skb)->tag = txmsg.tag;
1185
1186         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1187                 atomic_inc(&iucv->msg_sent);
1188                 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1189                 if (err) {
1190                         atomic_dec(&iucv->msg_sent);
1191                         goto out;
1192                 }
1193         } else { /* Classic VM IUCV transport */
1194                 skb_queue_tail(&iucv->send_skb_q, skb);
1195
1196                 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1197                     skb->len <= 7) {
1198                         err = iucv_send_iprm(iucv->path, &txmsg, skb);
1199
1200                         /* on success: there is no message_complete callback */
1201                         /* for an IPRMDATA msg; remove skb from send queue   */
1202                         if (err == 0) {
1203                                 skb_unlink(skb, &iucv->send_skb_q);
1204                                 kfree_skb(skb);
1205                         }
1206
1207                         /* this error should never happen since the     */
1208                         /* IUCV_IPRMDATA path flag is set... sever path */
1209                         if (err == 0x15) {
1210                                 pr_iucv->path_sever(iucv->path, NULL);
1211                                 skb_unlink(skb, &iucv->send_skb_q);
1212                                 err = -EPIPE;
1213                                 goto fail;
1214                         }
1215                 } else if (skb_is_nonlinear(skb)) {
1216                         struct iucv_array *iba = (struct iucv_array *)skb->head;
1217                         int i;
1218
1219                         /* skip iucv_array lying in the headroom */
1220                         iba[0].address = (u32)(addr_t)skb->data;
1221                         iba[0].length = (u32)skb_headlen(skb);
1222                         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1223                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1224
1225                                 iba[i + 1].address =
1226                                         (u32)(addr_t)skb_frag_address(frag);
1227                                 iba[i + 1].length = (u32)skb_frag_size(frag);
1228                         }
1229                         err = pr_iucv->message_send(iucv->path, &txmsg,
1230                                                     IUCV_IPBUFLST, 0,
1231                                                     (void *)iba, skb->len);
1232                 } else { /* non-IPRM Linear skb */
1233                         err = pr_iucv->message_send(iucv->path, &txmsg,
1234                                         0, 0, (void *)skb->data, skb->len);
1235                 }
1236                 if (err) {
1237                         if (err == 3) {
1238                                 user_id[8] = 0;
1239                                 memcpy(user_id, iucv->dst_user_id, 8);
1240                                 appl_id[8] = 0;
1241                                 memcpy(appl_id, iucv->dst_name, 8);
1242                                 pr_err(
1243                 "Application %s on z/VM guest %s exceeds message limit\n",
1244                                         appl_id, user_id);
1245                                 err = -EAGAIN;
1246                         } else {
1247                                 err = -EPIPE;
1248                         }
1249                         skb_unlink(skb, &iucv->send_skb_q);
1250                         goto fail;
1251                 }
1252         }
1253
1254         release_sock(sk);
1255         return len;
1256
1257 fail:
1258         kfree_skb(skb);
1259 out:
1260         release_sock(sk);
1261         return err;
1262 }
1263
1264 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1265 {
1266         size_t headroom, linear;
1267         struct sk_buff *skb;
1268         int err;
1269
1270         if (len < PAGE_SIZE) {
1271                 headroom = 0;
1272                 linear = len;
1273         } else {
1274                 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1275                 linear = PAGE_SIZE - headroom;
1276         }
1277         skb = alloc_skb_with_frags(headroom + linear, len - linear,
1278                                    0, &err, GFP_ATOMIC | GFP_DMA);
1279         WARN_ONCE(!skb,
1280                   "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1281                   len, err);
1282         if (skb) {
1283                 if (headroom)
1284                         skb_reserve(skb, headroom);
1285                 skb_put(skb, linear);
1286                 skb->len = len;
1287                 skb->data_len = len - linear;
1288         }
1289         return skb;
1290 }
1291
1292 /* iucv_process_message() - Receive a single outstanding IUCV message
1293  *
1294  * Locking: must be called with message_q.lock held
1295  */
1296 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1297                                  struct iucv_path *path,
1298                                  struct iucv_message *msg)
1299 {
1300         int rc;
1301         unsigned int len;
1302
1303         len = iucv_msg_length(msg);
1304
1305         /* store msg target class in the second 4 bytes of skb ctrl buffer */
1306         /* Note: the first 4 bytes are reserved for msg tag */
1307         IUCV_SKB_CB(skb)->class = msg->class;
1308
1309         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1310         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1311                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1312                         skb->data = NULL;
1313                         skb->len = 0;
1314                 }
1315         } else {
1316                 if (skb_is_nonlinear(skb)) {
1317                         struct iucv_array *iba = (struct iucv_array *)skb->head;
1318                         int i;
1319
1320                         iba[0].address = (u32)(addr_t)skb->data;
1321                         iba[0].length = (u32)skb_headlen(skb);
1322                         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1323                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1324
1325                                 iba[i + 1].address =
1326                                         (u32)(addr_t)skb_frag_address(frag);
1327                                 iba[i + 1].length = (u32)skb_frag_size(frag);
1328                         }
1329                         rc = pr_iucv->message_receive(path, msg,
1330                                               IUCV_IPBUFLST,
1331                                               (void *)iba, len, NULL);
1332                 } else {
1333                         rc = pr_iucv->message_receive(path, msg,
1334                                               msg->flags & IUCV_IPRMDATA,
1335                                               skb->data, len, NULL);
1336                 }
1337                 if (rc) {
1338                         kfree_skb(skb);
1339                         return;
1340                 }
1341                 WARN_ON_ONCE(skb->len != len);
1342         }
1343
1344         IUCV_SKB_CB(skb)->offset = 0;
1345         if (sk_filter(sk, skb)) {
1346                 atomic_inc(&sk->sk_drops);      /* skb rejected by filter */
1347                 kfree_skb(skb);
1348                 return;
1349         }
1350         if (__sock_queue_rcv_skb(sk, skb))      /* handle rcv queue full */
1351                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1352 }
1353
1354 /* iucv_process_message_q() - Process outstanding IUCV messages
1355  *
1356  * Locking: must be called with message_q.lock held
1357  */
1358 static void iucv_process_message_q(struct sock *sk)
1359 {
1360         struct iucv_sock *iucv = iucv_sk(sk);
1361         struct sk_buff *skb;
1362         struct sock_msg_q *p, *n;
1363
1364         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1365                 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1366                 if (!skb)
1367                         break;
1368                 iucv_process_message(sk, skb, p->path, &p->msg);
1369                 list_del(&p->list);
1370                 kfree(p);
1371                 if (!skb_queue_empty(&iucv->backlog_skb_q))
1372                         break;
1373         }
1374 }
1375
1376 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1377                              size_t len, int flags)
1378 {
1379         int noblock = flags & MSG_DONTWAIT;
1380         struct sock *sk = sock->sk;
1381         struct iucv_sock *iucv = iucv_sk(sk);
1382         unsigned int copied, rlen;
1383         struct sk_buff *skb, *rskb, *cskb;
1384         int err = 0;
1385         u32 offset;
1386
1387         if ((sk->sk_state == IUCV_DISCONN) &&
1388             skb_queue_empty(&iucv->backlog_skb_q) &&
1389             skb_queue_empty(&sk->sk_receive_queue) &&
1390             list_empty(&iucv->message_q.list))
1391                 return 0;
1392
1393         if (flags & (MSG_OOB))
1394                 return -EOPNOTSUPP;
1395
1396         /* receive/dequeue next skb:
1397          * the function understands MSG_PEEK and, thus, does not dequeue skb */
1398         skb = skb_recv_datagram(sk, flags, noblock, &err);
1399         if (!skb) {
1400                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1401                         return 0;
1402                 return err;
1403         }
1404
1405         offset = IUCV_SKB_CB(skb)->offset;
1406         rlen   = skb->len - offset;             /* real length of skb */
1407         copied = min_t(unsigned int, rlen, len);
1408         if (!rlen)
1409                 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1410
1411         cskb = skb;
1412         if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1413                 if (!(flags & MSG_PEEK))
1414                         skb_queue_head(&sk->sk_receive_queue, skb);
1415                 return -EFAULT;
1416         }
1417
1418         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1419         if (sk->sk_type == SOCK_SEQPACKET) {
1420                 if (copied < rlen)
1421                         msg->msg_flags |= MSG_TRUNC;
1422                 /* each iucv message contains a complete record */
1423                 msg->msg_flags |= MSG_EOR;
1424         }
1425
1426         /* create control message to store iucv msg target class:
1427          * get the trgcls from the control buffer of the skb due to
1428          * fragmentation of original iucv message. */
1429         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1430                        sizeof(IUCV_SKB_CB(skb)->class),
1431                        (void *)&IUCV_SKB_CB(skb)->class);
1432         if (err) {
1433                 if (!(flags & MSG_PEEK))
1434                         skb_queue_head(&sk->sk_receive_queue, skb);
1435                 return err;
1436         }
1437
1438         /* Mark read part of skb as used */
1439         if (!(flags & MSG_PEEK)) {
1440
1441                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1442                 if (sk->sk_type == SOCK_STREAM) {
1443                         if (copied < rlen) {
1444                                 IUCV_SKB_CB(skb)->offset = offset + copied;
1445                                 skb_queue_head(&sk->sk_receive_queue, skb);
1446                                 goto done;
1447                         }
1448                 }
1449
1450                 kfree_skb(skb);
1451                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1452                         atomic_inc(&iucv->msg_recv);
1453                         if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1454                                 WARN_ON(1);
1455                                 iucv_sock_close(sk);
1456                                 return -EFAULT;
1457                         }
1458                 }
1459
1460                 /* Queue backlog skbs */
1461                 spin_lock_bh(&iucv->message_q.lock);
1462                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1463                 while (rskb) {
1464                         IUCV_SKB_CB(rskb)->offset = 0;
1465                         if (__sock_queue_rcv_skb(sk, rskb)) {
1466                                 /* handle rcv queue full */
1467                                 skb_queue_head(&iucv->backlog_skb_q,
1468                                                 rskb);
1469                                 break;
1470                         }
1471                         rskb = skb_dequeue(&iucv->backlog_skb_q);
1472                 }
1473                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1474                         if (!list_empty(&iucv->message_q.list))
1475                                 iucv_process_message_q(sk);
1476                         if (atomic_read(&iucv->msg_recv) >=
1477                                                         iucv->msglimit / 2) {
1478                                 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1479                                 if (err) {
1480                                         sk->sk_state = IUCV_DISCONN;
1481                                         sk->sk_state_change(sk);
1482                                 }
1483                         }
1484                 }
1485                 spin_unlock_bh(&iucv->message_q.lock);
1486         }
1487
1488 done:
1489         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1490         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1491                 copied = rlen;
1492
1493         return copied;
1494 }
1495
1496 static inline __poll_t iucv_accept_poll(struct sock *parent)
1497 {
1498         struct iucv_sock *isk, *n;
1499         struct sock *sk;
1500
1501         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1502                 sk = (struct sock *) isk;
1503
1504                 if (sk->sk_state == IUCV_CONNECTED)
1505                         return EPOLLIN | EPOLLRDNORM;
1506         }
1507
1508         return 0;
1509 }
1510
1511 __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1512                             poll_table *wait)
1513 {
1514         struct sock *sk = sock->sk;
1515         __poll_t mask = 0;
1516
1517         sock_poll_wait(file, sock, wait);
1518
1519         if (sk->sk_state == IUCV_LISTEN)
1520                 return iucv_accept_poll(sk);
1521
1522         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1523                 mask |= EPOLLERR |
1524                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1525
1526         if (sk->sk_shutdown & RCV_SHUTDOWN)
1527                 mask |= EPOLLRDHUP;
1528
1529         if (sk->sk_shutdown == SHUTDOWN_MASK)
1530                 mask |= EPOLLHUP;
1531
1532         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1533             (sk->sk_shutdown & RCV_SHUTDOWN))
1534                 mask |= EPOLLIN | EPOLLRDNORM;
1535
1536         if (sk->sk_state == IUCV_CLOSED)
1537                 mask |= EPOLLHUP;
1538
1539         if (sk->sk_state == IUCV_DISCONN)
1540                 mask |= EPOLLIN;
1541
1542         if (sock_writeable(sk) && iucv_below_msglim(sk))
1543                 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1544         else
1545                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1546
1547         return mask;
1548 }
1549
1550 static int iucv_sock_shutdown(struct socket *sock, int how)
1551 {
1552         struct sock *sk = sock->sk;
1553         struct iucv_sock *iucv = iucv_sk(sk);
1554         struct iucv_message txmsg;
1555         int err = 0;
1556
1557         how++;
1558
1559         if ((how & ~SHUTDOWN_MASK) || !how)
1560                 return -EINVAL;
1561
1562         lock_sock(sk);
1563         switch (sk->sk_state) {
1564         case IUCV_LISTEN:
1565         case IUCV_DISCONN:
1566         case IUCV_CLOSING:
1567         case IUCV_CLOSED:
1568                 err = -ENOTCONN;
1569                 goto fail;
1570         default:
1571                 break;
1572         }
1573
1574         if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) &&
1575             sk->sk_state == IUCV_CONNECTED) {
1576                 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1577                         txmsg.class = 0;
1578                         txmsg.tag = 0;
1579                         err = pr_iucv->message_send(iucv->path, &txmsg,
1580                                 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1581                         if (err) {
1582                                 switch (err) {
1583                                 case 1:
1584                                         err = -ENOTCONN;
1585                                         break;
1586                                 case 2:
1587                                         err = -ECONNRESET;
1588                                         break;
1589                                 default:
1590                                         err = -ENOTCONN;
1591                                         break;
1592                                 }
1593                         }
1594                 } else
1595                         iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1596         }
1597
1598         sk->sk_shutdown |= how;
1599         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1600                 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1601                     iucv->path) {
1602                         err = pr_iucv->path_quiesce(iucv->path, NULL);
1603                         if (err)
1604                                 err = -ENOTCONN;
1605 /*                      skb_queue_purge(&sk->sk_receive_queue); */
1606                 }
1607                 skb_queue_purge(&sk->sk_receive_queue);
1608         }
1609
1610         /* Wake up anyone sleeping in poll */
1611         sk->sk_state_change(sk);
1612
1613 fail:
1614         release_sock(sk);
1615         return err;
1616 }
1617
1618 static int iucv_sock_release(struct socket *sock)
1619 {
1620         struct sock *sk = sock->sk;
1621         int err = 0;
1622
1623         if (!sk)
1624                 return 0;
1625
1626         iucv_sock_close(sk);
1627
1628         sock_orphan(sk);
1629         iucv_sock_kill(sk);
1630         return err;
1631 }
1632
1633 /* getsockopt and setsockopt */
1634 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1635                                 char __user *optval, unsigned int optlen)
1636 {
1637         struct sock *sk = sock->sk;
1638         struct iucv_sock *iucv = iucv_sk(sk);
1639         int val;
1640         int rc;
1641
1642         if (level != SOL_IUCV)
1643                 return -ENOPROTOOPT;
1644
1645         if (optlen < sizeof(int))
1646                 return -EINVAL;
1647
1648         if (get_user(val, (int __user *) optval))
1649                 return -EFAULT;
1650
1651         rc = 0;
1652
1653         lock_sock(sk);
1654         switch (optname) {
1655         case SO_IPRMDATA_MSG:
1656                 if (val)
1657                         iucv->flags |= IUCV_IPRMDATA;
1658                 else
1659                         iucv->flags &= ~IUCV_IPRMDATA;
1660                 break;
1661         case SO_MSGLIMIT:
1662                 switch (sk->sk_state) {
1663                 case IUCV_OPEN:
1664                 case IUCV_BOUND:
1665                         if (val < 1 || val > (u16)(~0))
1666                                 rc = -EINVAL;
1667                         else
1668                                 iucv->msglimit = val;
1669                         break;
1670                 default:
1671                         rc = -EINVAL;
1672                         break;
1673                 }
1674                 break;
1675         default:
1676                 rc = -ENOPROTOOPT;
1677                 break;
1678         }
1679         release_sock(sk);
1680
1681         return rc;
1682 }
1683
1684 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1685                                 char __user *optval, int __user *optlen)
1686 {
1687         struct sock *sk = sock->sk;
1688         struct iucv_sock *iucv = iucv_sk(sk);
1689         unsigned int val;
1690         int len;
1691
1692         if (level != SOL_IUCV)
1693                 return -ENOPROTOOPT;
1694
1695         if (get_user(len, optlen))
1696                 return -EFAULT;
1697
1698         if (len < 0)
1699                 return -EINVAL;
1700
1701         len = min_t(unsigned int, len, sizeof(int));
1702
1703         switch (optname) {
1704         case SO_IPRMDATA_MSG:
1705                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1706                 break;
1707         case SO_MSGLIMIT:
1708                 lock_sock(sk);
1709                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1710                                            : iucv->msglimit;    /* default */
1711                 release_sock(sk);
1712                 break;
1713         case SO_MSGSIZE:
1714                 if (sk->sk_state == IUCV_OPEN)
1715                         return -EBADFD;
1716                 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1717                                 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1718                                 0x7fffffff;
1719                 break;
1720         default:
1721                 return -ENOPROTOOPT;
1722         }
1723
1724         if (put_user(len, optlen))
1725                 return -EFAULT;
1726         if (copy_to_user(optval, &val, len))
1727                 return -EFAULT;
1728
1729         return 0;
1730 }
1731
1732
1733 /* Callback wrappers - called from iucv base support */
1734 static int iucv_callback_connreq(struct iucv_path *path,
1735                                  u8 ipvmid[8], u8 ipuser[16])
1736 {
1737         unsigned char user_data[16];
1738         unsigned char nuser_data[16];
1739         unsigned char src_name[8];
1740         struct sock *sk, *nsk;
1741         struct iucv_sock *iucv, *niucv;
1742         int err;
1743
1744         memcpy(src_name, ipuser, 8);
1745         EBCASC(src_name, 8);
1746         /* Find out if this path belongs to af_iucv. */
1747         read_lock(&iucv_sk_list.lock);
1748         iucv = NULL;
1749         sk = NULL;
1750         sk_for_each(sk, &iucv_sk_list.head)
1751                 if (sk->sk_state == IUCV_LISTEN &&
1752                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1753                         /*
1754                          * Found a listening socket with
1755                          * src_name == ipuser[0-7].
1756                          */
1757                         iucv = iucv_sk(sk);
1758                         break;
1759                 }
1760         read_unlock(&iucv_sk_list.lock);
1761         if (!iucv)
1762                 /* No socket found, not one of our paths. */
1763                 return -EINVAL;
1764
1765         bh_lock_sock(sk);
1766
1767         /* Check if parent socket is listening */
1768         low_nmcpy(user_data, iucv->src_name);
1769         high_nmcpy(user_data, iucv->dst_name);
1770         ASCEBC(user_data, sizeof(user_data));
1771         if (sk->sk_state != IUCV_LISTEN) {
1772                 err = pr_iucv->path_sever(path, user_data);
1773                 iucv_path_free(path);
1774                 goto fail;
1775         }
1776
1777         /* Check for backlog size */
1778         if (sk_acceptq_is_full(sk)) {
1779                 err = pr_iucv->path_sever(path, user_data);
1780                 iucv_path_free(path);
1781                 goto fail;
1782         }
1783
1784         /* Create the new socket */
1785         nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1786         if (!nsk) {
1787                 err = pr_iucv->path_sever(path, user_data);
1788                 iucv_path_free(path);
1789                 goto fail;
1790         }
1791
1792         niucv = iucv_sk(nsk);
1793         iucv_sock_init(nsk, sk);
1794
1795         /* Set the new iucv_sock */
1796         memcpy(niucv->dst_name, ipuser + 8, 8);
1797         EBCASC(niucv->dst_name, 8);
1798         memcpy(niucv->dst_user_id, ipvmid, 8);
1799         memcpy(niucv->src_name, iucv->src_name, 8);
1800         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1801         niucv->path = path;
1802
1803         /* Call iucv_accept */
1804         high_nmcpy(nuser_data, ipuser + 8);
1805         memcpy(nuser_data + 8, niucv->src_name, 8);
1806         ASCEBC(nuser_data + 8, 8);
1807
1808         /* set message limit for path based on msglimit of accepting socket */
1809         niucv->msglimit = iucv->msglimit;
1810         path->msglim = iucv->msglimit;
1811         err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1812         if (err) {
1813                 iucv_sever_path(nsk, 1);
1814                 iucv_sock_kill(nsk);
1815                 goto fail;
1816         }
1817
1818         iucv_accept_enqueue(sk, nsk);
1819
1820         /* Wake up accept */
1821         nsk->sk_state = IUCV_CONNECTED;
1822         sk->sk_data_ready(sk);
1823         err = 0;
1824 fail:
1825         bh_unlock_sock(sk);
1826         return 0;
1827 }
1828
1829 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1830 {
1831         struct sock *sk = path->private;
1832
1833         sk->sk_state = IUCV_CONNECTED;
1834         sk->sk_state_change(sk);
1835 }
1836
1837 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1838 {
1839         struct sock *sk = path->private;
1840         struct iucv_sock *iucv = iucv_sk(sk);
1841         struct sk_buff *skb;
1842         struct sock_msg_q *save_msg;
1843         int len;
1844
1845         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1846                 pr_iucv->message_reject(path, msg);
1847                 return;
1848         }
1849
1850         spin_lock(&iucv->message_q.lock);
1851
1852         if (!list_empty(&iucv->message_q.list) ||
1853             !skb_queue_empty(&iucv->backlog_skb_q))
1854                 goto save_message;
1855
1856         len = atomic_read(&sk->sk_rmem_alloc);
1857         len += SKB_TRUESIZE(iucv_msg_length(msg));
1858         if (len > sk->sk_rcvbuf)
1859                 goto save_message;
1860
1861         skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1862         if (!skb)
1863                 goto save_message;
1864
1865         iucv_process_message(sk, skb, path, msg);
1866         goto out_unlock;
1867
1868 save_message:
1869         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1870         if (!save_msg)
1871                 goto out_unlock;
1872         save_msg->path = path;
1873         save_msg->msg = *msg;
1874
1875         list_add_tail(&save_msg->list, &iucv->message_q.list);
1876
1877 out_unlock:
1878         spin_unlock(&iucv->message_q.lock);
1879 }
1880
1881 static void iucv_callback_txdone(struct iucv_path *path,
1882                                  struct iucv_message *msg)
1883 {
1884         struct sock *sk = path->private;
1885         struct sk_buff *this = NULL;
1886         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1887         struct sk_buff *list_skb = list->next;
1888         unsigned long flags;
1889
1890         bh_lock_sock(sk);
1891         if (!skb_queue_empty(list)) {
1892                 spin_lock_irqsave(&list->lock, flags);
1893
1894                 while (list_skb != (struct sk_buff *)list) {
1895                         if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1896                                 this = list_skb;
1897                                 break;
1898                         }
1899                         list_skb = list_skb->next;
1900                 }
1901                 if (this)
1902                         __skb_unlink(this, list);
1903
1904                 spin_unlock_irqrestore(&list->lock, flags);
1905
1906                 if (this) {
1907                         kfree_skb(this);
1908                         /* wake up any process waiting for sending */
1909                         iucv_sock_wake_msglim(sk);
1910                 }
1911         }
1912
1913         if (sk->sk_state == IUCV_CLOSING) {
1914                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1915                         sk->sk_state = IUCV_CLOSED;
1916                         sk->sk_state_change(sk);
1917                 }
1918         }
1919         bh_unlock_sock(sk);
1920
1921 }
1922
1923 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1924 {
1925         struct sock *sk = path->private;
1926
1927         if (sk->sk_state == IUCV_CLOSED)
1928                 return;
1929
1930         bh_lock_sock(sk);
1931         iucv_sever_path(sk, 1);
1932         sk->sk_state = IUCV_DISCONN;
1933
1934         sk->sk_state_change(sk);
1935         bh_unlock_sock(sk);
1936 }
1937
1938 /* called if the other communication side shuts down its RECV direction;
1939  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1940  */
1941 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1942 {
1943         struct sock *sk = path->private;
1944
1945         bh_lock_sock(sk);
1946         if (sk->sk_state != IUCV_CLOSED) {
1947                 sk->sk_shutdown |= SEND_SHUTDOWN;
1948                 sk->sk_state_change(sk);
1949         }
1950         bh_unlock_sock(sk);
1951 }
1952
1953 /***************** HiperSockets transport callbacks ********************/
1954 static void afiucv_swap_src_dest(struct sk_buff *skb)
1955 {
1956         struct af_iucv_trans_hdr *trans_hdr =
1957                                 (struct af_iucv_trans_hdr *)skb->data;
1958         char tmpID[8];
1959         char tmpName[8];
1960
1961         ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1962         ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1963         ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1964         ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1965         memcpy(tmpID, trans_hdr->srcUserID, 8);
1966         memcpy(tmpName, trans_hdr->srcAppName, 8);
1967         memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1968         memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1969         memcpy(trans_hdr->destUserID, tmpID, 8);
1970         memcpy(trans_hdr->destAppName, tmpName, 8);
1971         skb_push(skb, ETH_HLEN);
1972         memset(skb->data, 0, ETH_HLEN);
1973 }
1974
1975 /**
1976  * afiucv_hs_callback_syn - react on received SYN
1977  **/
1978 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1979 {
1980         struct sock *nsk;
1981         struct iucv_sock *iucv, *niucv;
1982         struct af_iucv_trans_hdr *trans_hdr;
1983         int err;
1984
1985         iucv = iucv_sk(sk);
1986         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1987         if (!iucv) {
1988                 /* no sock - connection refused */
1989                 afiucv_swap_src_dest(skb);
1990                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1991                 err = dev_queue_xmit(skb);
1992                 goto out;
1993         }
1994
1995         nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1996         bh_lock_sock(sk);
1997         if ((sk->sk_state != IUCV_LISTEN) ||
1998             sk_acceptq_is_full(sk) ||
1999             !nsk) {
2000                 /* error on server socket - connection refused */
2001                 afiucv_swap_src_dest(skb);
2002                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
2003                 err = dev_queue_xmit(skb);
2004                 iucv_sock_kill(nsk);
2005                 bh_unlock_sock(sk);
2006                 goto out;
2007         }
2008
2009         niucv = iucv_sk(nsk);
2010         iucv_sock_init(nsk, sk);
2011         niucv->transport = AF_IUCV_TRANS_HIPER;
2012         niucv->msglimit = iucv->msglimit;
2013         if (!trans_hdr->window)
2014                 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
2015         else
2016                 niucv->msglimit_peer = trans_hdr->window;
2017         memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
2018         memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
2019         memcpy(niucv->src_name, iucv->src_name, 8);
2020         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2021         nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2022         niucv->hs_dev = iucv->hs_dev;
2023         dev_hold(niucv->hs_dev);
2024         afiucv_swap_src_dest(skb);
2025         trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2026         trans_hdr->window = niucv->msglimit;
2027         /* if receiver acks the xmit connection is established */
2028         err = dev_queue_xmit(skb);
2029         if (!err) {
2030                 iucv_accept_enqueue(sk, nsk);
2031                 nsk->sk_state = IUCV_CONNECTED;
2032                 sk->sk_data_ready(sk);
2033         } else
2034                 iucv_sock_kill(nsk);
2035         bh_unlock_sock(sk);
2036
2037 out:
2038         return NET_RX_SUCCESS;
2039 }
2040
2041 /**
2042  * afiucv_hs_callback_synack() - react on received SYN-ACK
2043  **/
2044 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2045 {
2046         struct iucv_sock *iucv = iucv_sk(sk);
2047         struct af_iucv_trans_hdr *trans_hdr =
2048                                         (struct af_iucv_trans_hdr *)skb->data;
2049
2050         if (!iucv)
2051                 goto out;
2052         if (sk->sk_state != IUCV_BOUND)
2053                 goto out;
2054         bh_lock_sock(sk);
2055         iucv->msglimit_peer = trans_hdr->window;
2056         sk->sk_state = IUCV_CONNECTED;
2057         sk->sk_state_change(sk);
2058         bh_unlock_sock(sk);
2059 out:
2060         kfree_skb(skb);
2061         return NET_RX_SUCCESS;
2062 }
2063
2064 /**
2065  * afiucv_hs_callback_synfin() - react on received SYN_FIN
2066  **/
2067 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2068 {
2069         struct iucv_sock *iucv = iucv_sk(sk);
2070
2071         if (!iucv)
2072                 goto out;
2073         if (sk->sk_state != IUCV_BOUND)
2074                 goto out;
2075         bh_lock_sock(sk);
2076         sk->sk_state = IUCV_DISCONN;
2077         sk->sk_state_change(sk);
2078         bh_unlock_sock(sk);
2079 out:
2080         kfree_skb(skb);
2081         return NET_RX_SUCCESS;
2082 }
2083
2084 /**
2085  * afiucv_hs_callback_fin() - react on received FIN
2086  **/
2087 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2088 {
2089         struct iucv_sock *iucv = iucv_sk(sk);
2090
2091         /* other end of connection closed */
2092         if (!iucv)
2093                 goto out;
2094         bh_lock_sock(sk);
2095         if (sk->sk_state == IUCV_CONNECTED) {
2096                 sk->sk_state = IUCV_DISCONN;
2097                 sk->sk_state_change(sk);
2098         }
2099         bh_unlock_sock(sk);
2100 out:
2101         kfree_skb(skb);
2102         return NET_RX_SUCCESS;
2103 }
2104
2105 /**
2106  * afiucv_hs_callback_win() - react on received WIN
2107  **/
2108 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2109 {
2110         struct iucv_sock *iucv = iucv_sk(sk);
2111         struct af_iucv_trans_hdr *trans_hdr =
2112                                         (struct af_iucv_trans_hdr *)skb->data;
2113
2114         if (!iucv)
2115                 return NET_RX_SUCCESS;
2116
2117         if (sk->sk_state != IUCV_CONNECTED)
2118                 return NET_RX_SUCCESS;
2119
2120         atomic_sub(trans_hdr->window, &iucv->msg_sent);
2121         iucv_sock_wake_msglim(sk);
2122         return NET_RX_SUCCESS;
2123 }
2124
2125 /**
2126  * afiucv_hs_callback_rx() - react on received data
2127  **/
2128 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2129 {
2130         struct iucv_sock *iucv = iucv_sk(sk);
2131
2132         if (!iucv) {
2133                 kfree_skb(skb);
2134                 return NET_RX_SUCCESS;
2135         }
2136
2137         if (sk->sk_state != IUCV_CONNECTED) {
2138                 kfree_skb(skb);
2139                 return NET_RX_SUCCESS;
2140         }
2141
2142         if (sk->sk_shutdown & RCV_SHUTDOWN) {
2143                 kfree_skb(skb);
2144                 return NET_RX_SUCCESS;
2145         }
2146
2147         /* write stuff from iucv_msg to skb cb */
2148         skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2149         skb_reset_transport_header(skb);
2150         skb_reset_network_header(skb);
2151         IUCV_SKB_CB(skb)->offset = 0;
2152         if (sk_filter(sk, skb)) {
2153                 atomic_inc(&sk->sk_drops);      /* skb rejected by filter */
2154                 kfree_skb(skb);
2155                 return NET_RX_SUCCESS;
2156         }
2157
2158         spin_lock(&iucv->message_q.lock);
2159         if (skb_queue_empty(&iucv->backlog_skb_q)) {
2160                 if (__sock_queue_rcv_skb(sk, skb))
2161                         /* handle rcv queue full */
2162                         skb_queue_tail(&iucv->backlog_skb_q, skb);
2163         } else
2164                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2165         spin_unlock(&iucv->message_q.lock);
2166         return NET_RX_SUCCESS;
2167 }
2168
2169 /**
2170  * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2171  *                   transport
2172  *                   called from netif RX softirq
2173  **/
2174 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2175         struct packet_type *pt, struct net_device *orig_dev)
2176 {
2177         struct sock *sk;
2178         struct iucv_sock *iucv;
2179         struct af_iucv_trans_hdr *trans_hdr;
2180         int err = NET_RX_SUCCESS;
2181         char nullstring[8];
2182
2183         if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2184                 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2185                           (int)skb->len,
2186                           (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2187                 kfree_skb(skb);
2188                 return NET_RX_SUCCESS;
2189         }
2190         if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2191                 if (skb_linearize(skb)) {
2192                         WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2193                                   (int)skb->len);
2194                         kfree_skb(skb);
2195                         return NET_RX_SUCCESS;
2196                 }
2197         skb_pull(skb, ETH_HLEN);
2198         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2199         EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2200         EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2201         EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2202         EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2203         memset(nullstring, 0, sizeof(nullstring));
2204         iucv = NULL;
2205         sk = NULL;
2206         read_lock(&iucv_sk_list.lock);
2207         sk_for_each(sk, &iucv_sk_list.head) {
2208                 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2209                         if ((!memcmp(&iucv_sk(sk)->src_name,
2210                                      trans_hdr->destAppName, 8)) &&
2211                             (!memcmp(&iucv_sk(sk)->src_user_id,
2212                                      trans_hdr->destUserID, 8)) &&
2213                             (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2214                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2215                                      nullstring, 8))) {
2216                                 iucv = iucv_sk(sk);
2217                                 break;
2218                         }
2219                 } else {
2220                         if ((!memcmp(&iucv_sk(sk)->src_name,
2221                                      trans_hdr->destAppName, 8)) &&
2222                             (!memcmp(&iucv_sk(sk)->src_user_id,
2223                                      trans_hdr->destUserID, 8)) &&
2224                             (!memcmp(&iucv_sk(sk)->dst_name,
2225                                      trans_hdr->srcAppName, 8)) &&
2226                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2227                                      trans_hdr->srcUserID, 8))) {
2228                                 iucv = iucv_sk(sk);
2229                                 break;
2230                         }
2231                 }
2232         }
2233         read_unlock(&iucv_sk_list.lock);
2234         if (!iucv)
2235                 sk = NULL;
2236
2237         /* no sock
2238         how should we send with no sock
2239         1) send without sock no send rc checking?
2240         2) introduce default sock to handle this cases
2241
2242          SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2243          data -> send FIN
2244          SYN|ACK, SYN|FIN, FIN -> no action? */
2245
2246         switch (trans_hdr->flags) {
2247         case AF_IUCV_FLAG_SYN:
2248                 /* connect request */
2249                 err = afiucv_hs_callback_syn(sk, skb);
2250                 break;
2251         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2252                 /* connect request confirmed */
2253                 err = afiucv_hs_callback_synack(sk, skb);
2254                 break;
2255         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2256                 /* connect request refused */
2257                 err = afiucv_hs_callback_synfin(sk, skb);
2258                 break;
2259         case (AF_IUCV_FLAG_FIN):
2260                 /* close request */
2261                 err = afiucv_hs_callback_fin(sk, skb);
2262                 break;
2263         case (AF_IUCV_FLAG_WIN):
2264                 err = afiucv_hs_callback_win(sk, skb);
2265                 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2266                         kfree_skb(skb);
2267                         break;
2268                 }
2269                 /* fall through and receive non-zero length data */
2270         case (AF_IUCV_FLAG_SHT):
2271                 /* shutdown request */
2272                 /* fall through and receive zero length data */
2273         case 0:
2274                 /* plain data frame */
2275                 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2276                 err = afiucv_hs_callback_rx(sk, skb);
2277                 break;
2278         default:
2279                 kfree_skb(skb);
2280         }
2281
2282         return err;
2283 }
2284
2285 /**
2286  * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2287  *                                 transport
2288  **/
2289 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2290                                         enum iucv_tx_notify n)
2291 {
2292         struct sock *isk = skb->sk;
2293         struct sock *sk = NULL;
2294         struct iucv_sock *iucv = NULL;
2295         struct sk_buff_head *list;
2296         struct sk_buff *list_skb;
2297         struct sk_buff *nskb;
2298         unsigned long flags;
2299
2300         read_lock_irqsave(&iucv_sk_list.lock, flags);
2301         sk_for_each(sk, &iucv_sk_list.head)
2302                 if (sk == isk) {
2303                         iucv = iucv_sk(sk);
2304                         break;
2305                 }
2306         read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2307
2308         if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2309                 return;
2310
2311         list = &iucv->send_skb_q;
2312         spin_lock_irqsave(&list->lock, flags);
2313         if (skb_queue_empty(list))
2314                 goto out_unlock;
2315         list_skb = list->next;
2316         nskb = list_skb->next;
2317         while (list_skb != (struct sk_buff *)list) {
2318                 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2319                         switch (n) {
2320                         case TX_NOTIFY_OK:
2321                                 __skb_unlink(list_skb, list);
2322                                 kfree_skb(list_skb);
2323                                 iucv_sock_wake_msglim(sk);
2324                                 break;
2325                         case TX_NOTIFY_PENDING:
2326                                 atomic_inc(&iucv->pendings);
2327                                 break;
2328                         case TX_NOTIFY_DELAYED_OK:
2329                                 __skb_unlink(list_skb, list);
2330                                 atomic_dec(&iucv->pendings);
2331                                 if (atomic_read(&iucv->pendings) <= 0)
2332                                         iucv_sock_wake_msglim(sk);
2333                                 kfree_skb(list_skb);
2334                                 break;
2335                         case TX_NOTIFY_UNREACHABLE:
2336                         case TX_NOTIFY_DELAYED_UNREACHABLE:
2337                         case TX_NOTIFY_TPQFULL: /* not yet used */
2338                         case TX_NOTIFY_GENERALERROR:
2339                         case TX_NOTIFY_DELAYED_GENERALERROR:
2340                                 __skb_unlink(list_skb, list);
2341                                 kfree_skb(list_skb);
2342                                 if (sk->sk_state == IUCV_CONNECTED) {
2343                                         sk->sk_state = IUCV_DISCONN;
2344                                         sk->sk_state_change(sk);
2345                                 }
2346                                 break;
2347                         }
2348                         break;
2349                 }
2350                 list_skb = nskb;
2351                 nskb = nskb->next;
2352         }
2353 out_unlock:
2354         spin_unlock_irqrestore(&list->lock, flags);
2355
2356         if (sk->sk_state == IUCV_CLOSING) {
2357                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2358                         sk->sk_state = IUCV_CLOSED;
2359                         sk->sk_state_change(sk);
2360                 }
2361         }
2362
2363 }
2364
2365 /*
2366  * afiucv_netdev_event: handle netdev notifier chain events
2367  */
2368 static int afiucv_netdev_event(struct notifier_block *this,
2369                                unsigned long event, void *ptr)
2370 {
2371         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2372         struct sock *sk;
2373         struct iucv_sock *iucv;
2374
2375         switch (event) {
2376         case NETDEV_REBOOT:
2377         case NETDEV_GOING_DOWN:
2378                 sk_for_each(sk, &iucv_sk_list.head) {
2379                         iucv = iucv_sk(sk);
2380                         if ((iucv->hs_dev == event_dev) &&
2381                             (sk->sk_state == IUCV_CONNECTED)) {
2382                                 if (event == NETDEV_GOING_DOWN)
2383                                         iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2384                                 sk->sk_state = IUCV_DISCONN;
2385                                 sk->sk_state_change(sk);
2386                         }
2387                 }
2388                 break;
2389         case NETDEV_DOWN:
2390         case NETDEV_UNREGISTER:
2391         default:
2392                 break;
2393         }
2394         return NOTIFY_DONE;
2395 }
2396
2397 static struct notifier_block afiucv_netdev_notifier = {
2398         .notifier_call = afiucv_netdev_event,
2399 };
2400
2401 static const struct proto_ops iucv_sock_ops = {
2402         .family         = PF_IUCV,
2403         .owner          = THIS_MODULE,
2404         .release        = iucv_sock_release,
2405         .bind           = iucv_sock_bind,
2406         .connect        = iucv_sock_connect,
2407         .listen         = iucv_sock_listen,
2408         .accept         = iucv_sock_accept,
2409         .getname        = iucv_sock_getname,
2410         .sendmsg        = iucv_sock_sendmsg,
2411         .recvmsg        = iucv_sock_recvmsg,
2412         .poll           = iucv_sock_poll,
2413         .ioctl          = sock_no_ioctl,
2414         .mmap           = sock_no_mmap,
2415         .socketpair     = sock_no_socketpair,
2416         .shutdown       = iucv_sock_shutdown,
2417         .setsockopt     = iucv_sock_setsockopt,
2418         .getsockopt     = iucv_sock_getsockopt,
2419 };
2420
2421 static const struct net_proto_family iucv_sock_family_ops = {
2422         .family = AF_IUCV,
2423         .owner  = THIS_MODULE,
2424         .create = iucv_sock_create,
2425 };
2426
2427 static struct packet_type iucv_packet_type = {
2428         .type = cpu_to_be16(ETH_P_AF_IUCV),
2429         .func = afiucv_hs_rcv,
2430 };
2431
2432 static int afiucv_iucv_init(void)
2433 {
2434         int err;
2435
2436         err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2437         if (err)
2438                 goto out;
2439         /* establish dummy device */
2440         af_iucv_driver.bus = pr_iucv->bus;
2441         err = driver_register(&af_iucv_driver);
2442         if (err)
2443                 goto out_iucv;
2444         af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2445         if (!af_iucv_dev) {
2446                 err = -ENOMEM;
2447                 goto out_driver;
2448         }
2449         dev_set_name(af_iucv_dev, "af_iucv");
2450         af_iucv_dev->bus = pr_iucv->bus;
2451         af_iucv_dev->parent = pr_iucv->root;
2452         af_iucv_dev->release = (void (*)(struct device *))kfree;
2453         af_iucv_dev->driver = &af_iucv_driver;
2454         err = device_register(af_iucv_dev);
2455         if (err)
2456                 goto out_iucv_dev;
2457         return 0;
2458
2459 out_iucv_dev:
2460         put_device(af_iucv_dev);
2461 out_driver:
2462         driver_unregister(&af_iucv_driver);
2463 out_iucv:
2464         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2465 out:
2466         return err;
2467 }
2468
2469 static void afiucv_iucv_exit(void)
2470 {
2471         device_unregister(af_iucv_dev);
2472         driver_unregister(&af_iucv_driver);
2473         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2474 }
2475
2476 static int __init afiucv_init(void)
2477 {
2478         int err;
2479
2480         if (MACHINE_IS_VM) {
2481                 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2482                 if (unlikely(err)) {
2483                         WARN_ON(err);
2484                         err = -EPROTONOSUPPORT;
2485                         goto out;
2486                 }
2487
2488                 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2489                 if (!pr_iucv) {
2490                         printk(KERN_WARNING "iucv_if lookup failed\n");
2491                         memset(&iucv_userid, 0, sizeof(iucv_userid));
2492                 }
2493         } else {
2494                 memset(&iucv_userid, 0, sizeof(iucv_userid));
2495                 pr_iucv = NULL;
2496         }
2497
2498         err = proto_register(&iucv_proto, 0);
2499         if (err)
2500                 goto out;
2501         err = sock_register(&iucv_sock_family_ops);
2502         if (err)
2503                 goto out_proto;
2504
2505         if (pr_iucv) {
2506                 err = afiucv_iucv_init();
2507                 if (err)
2508                         goto out_sock;
2509         }
2510
2511         err = register_netdevice_notifier(&afiucv_netdev_notifier);
2512         if (err)
2513                 goto out_notifier;
2514
2515         dev_add_pack(&iucv_packet_type);
2516         return 0;
2517
2518 out_notifier:
2519         if (pr_iucv)
2520                 afiucv_iucv_exit();
2521 out_sock:
2522         sock_unregister(PF_IUCV);
2523 out_proto:
2524         proto_unregister(&iucv_proto);
2525 out:
2526         if (pr_iucv)
2527                 symbol_put(iucv_if);
2528         return err;
2529 }
2530
2531 static void __exit afiucv_exit(void)
2532 {
2533         if (pr_iucv) {
2534                 afiucv_iucv_exit();
2535                 symbol_put(iucv_if);
2536         }
2537
2538         unregister_netdevice_notifier(&afiucv_netdev_notifier);
2539         dev_remove_pack(&iucv_packet_type);
2540         sock_unregister(PF_IUCV);
2541         proto_unregister(&iucv_proto);
2542 }
2543
2544 module_init(afiucv_init);
2545 module_exit(afiucv_exit);
2546
2547 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2548 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2549 MODULE_VERSION(VERSION);
2550 MODULE_LICENSE("GPL");
2551 MODULE_ALIAS_NETPROTO(PF_IUCV);