kernel/net/iucv/af_iucv.c

   1 /*
   2  *  IUCV protocol stack for Linux on zSeries
   3  *
   4  *  Copyright IBM Corp. 2006, 2009
   5  *
   6  *  Author(s):  Jennifer Hunt <jenhunt@us.ibm.com>
   7  *              Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
   8  *  PM functions:
   9  *              Ursula Braun <ursula.braun@de.ibm.com>
  10  */
  11
  12 #define KMSG_COMPONENT "af_iucv"
  13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/list.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/slab.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/init.h>
  24 #include <linux/poll.h>
  25 #include <net/sock.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/cpcmd.h>
  28 #include <linux/kmod.h>
  29
  30 #include <net/iucv/af_iucv.h>
  31
  32 #define VERSION "1.2"
  33
  34 static char iucv_userid[80];
  35
  36 static const struct proto_ops iucv_sock_ops;
  37
  38 static struct proto iucv_proto = {
  39         .name           = "AF_IUCV",
  40         .owner          = THIS_MODULE,
  41         .obj_size       = sizeof(struct iucv_sock),
  42 };
  43
  44 static struct iucv_interface *pr_iucv;
  45
  46 /* special AF_IUCV IPRM messages */
  47 static const u8 iprm_shutdown[8] =
  48         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
  49
  50 #define TRGCLS_SIZE     (sizeof(((struct iucv_message *)0)->class))
  51
  52 #define __iucv_sock_wait(sk, condition, timeo, ret)                     \
  53 do {                                                                    \
  54         DEFINE_WAIT(__wait);                                            \
  55         long __timeo = timeo;                                           \
  56         ret = 0;                                                        \
  57         prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE);     \
  58         while (!(condition)) {                                          \
  59                 if (!__timeo) {                                         \
  60                         ret = -EAGAIN;                                  \
  61                         break;                                          \
  62                 }                                                       \
  63                 if (signal_pending(current)) {                          \
  64                         ret = sock_intr_errno(__timeo);                 \
  65                         break;                                          \
  66                 }                                                       \
  67                 release_sock(sk);                                       \
  68                 __timeo = schedule_timeout(__timeo);                    \
  69                 lock_sock(sk);                                          \
  70                 ret = sock_error(sk);                                   \
  71                 if (ret)                                                \
  72                         break;                                          \
  73         }                                                               \
  74         finish_wait(sk_sleep(sk), &__wait);                             \
  75 } while (0)
  76
  77 #define iucv_sock_wait(sk, condition, timeo)                            \
  78 ({                                                                      \
  79         int __ret = 0;                                                  \
  80         if (!(condition))                                               \
  81                 __iucv_sock_wait(sk, condition, timeo, __ret);          \
  82         __ret;                                                          \
  83 })
  84
  85 static void iucv_sock_kill(struct sock *sk);
  86 static void iucv_sock_close(struct sock *sk);
  87 static void iucv_sever_path(struct sock *, int);
  88
  89 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
  90         struct packet_type *pt, struct net_device *orig_dev);
  91 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
  92                    struct sk_buff *skb, u8 flags);
  93 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
  94
  95 /* Call Back functions */
  96 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  97 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
  98 static void iucv_callback_connack(struct iucv_path *, u8 *);
  99 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
 100 static void iucv_callback_connrej(struct iucv_path *, u8 *);
 101 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
 102
 103 static struct iucv_sock_list iucv_sk_list = {
 104         .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
 105         .autobind_name = ATOMIC_INIT(0)
 106 };
 107
 108 static struct iucv_handler af_iucv_handler = {
 109         .path_pending     = iucv_callback_connreq,
 110         .path_complete    = iucv_callback_connack,
 111         .path_severed     = iucv_callback_connrej,
 112         .message_pending  = iucv_callback_rx,
 113         .message_complete = iucv_callback_txdone,
 114         .path_quiesced    = iucv_callback_shutdown,
 115 };
 116
 117 static inline void high_nmcpy(unsigned char *dst, char *src)
 118 {
 119        memcpy(dst, src, 8);
 120 }
 121
 122 static inline void low_nmcpy(unsigned char *dst, char *src)
 123 {
 124        memcpy(&dst[8], src, 8);
 125 }
 126
 127 static int afiucv_pm_prepare(struct device *dev)
 128 {
 129 #ifdef CONFIG_PM_DEBUG
 130         printk(KERN_WARNING "afiucv_pm_prepare\n");
 131 #endif
 132         return 0;
 133 }
 134
 135 static void afiucv_pm_complete(struct device *dev)
 136 {
 137 #ifdef CONFIG_PM_DEBUG
 138         printk(KERN_WARNING "afiucv_pm_complete\n");
 139 #endif
 140 }
 141
 142 /**
 143  * afiucv_pm_freeze() - Freeze PM callback
 144  * @dev:        AFIUCV dummy device
 145  *
 146  * Sever all established IUCV communication pathes
 147  */
 148 static int afiucv_pm_freeze(struct device *dev)
 149 {
 150         struct iucv_sock *iucv;
 151         struct sock *sk;
 152         int err = 0;
 153
 154 #ifdef CONFIG_PM_DEBUG
 155         printk(KERN_WARNING "afiucv_pm_freeze\n");
 156 #endif
 157         read_lock(&iucv_sk_list.lock);
 158         sk_for_each(sk, &iucv_sk_list.head) {
 159                 iucv = iucv_sk(sk);
 160                 switch (sk->sk_state) {
 161                 case IUCV_DISCONN:
 162                 case IUCV_CLOSING:
 163                 case IUCV_CONNECTED:
 164                         iucv_sever_path(sk, 0);
 165                         break;
 166                 case IUCV_OPEN:
 167                 case IUCV_BOUND:
 168                 case IUCV_LISTEN:
 169                 case IUCV_CLOSED:
 170                 default:
 171                         break;
 172                 }
 173                 skb_queue_purge(&iucv->send_skb_q);
 174                 skb_queue_purge(&iucv->backlog_skb_q);
 175         }
 176         read_unlock(&iucv_sk_list.lock);
 177         return err;
 178 }
 179
 180 /**
 181  * afiucv_pm_restore_thaw() - Thaw and restore PM callback
 182  * @dev:        AFIUCV dummy device
 183  *
 184  * socket clean up after freeze
 185  */
 186 static int afiucv_pm_restore_thaw(struct device *dev)
 187 {
 188         struct sock *sk;
 189
 190 #ifdef CONFIG_PM_DEBUG
 191         printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
 192 #endif
 193         read_lock(&iucv_sk_list.lock);
 194         sk_for_each(sk, &iucv_sk_list.head) {
 195                 switch (sk->sk_state) {
 196                 case IUCV_CONNECTED:
 197                         sk->sk_err = EPIPE;
 198                         sk->sk_state = IUCV_DISCONN;
 199                         sk->sk_state_change(sk);
 200                         break;
 201                 case IUCV_DISCONN:
 202                 case IUCV_CLOSING:
 203                 case IUCV_LISTEN:
 204                 case IUCV_BOUND:
 205                 case IUCV_OPEN:
 206                 default:
 207                         break;
 208                 }
 209         }
 210         read_unlock(&iucv_sk_list.lock);
 211         return 0;
 212 }
 213
 214 static const struct dev_pm_ops afiucv_pm_ops = {
 215         .prepare = afiucv_pm_prepare,
 216         .complete = afiucv_pm_complete,
 217         .freeze = afiucv_pm_freeze,
 218         .thaw = afiucv_pm_restore_thaw,
 219         .restore = afiucv_pm_restore_thaw,
 220 };
 221
 222 static struct device_driver af_iucv_driver = {
 223         .owner = THIS_MODULE,
 224         .name = "afiucv",
 225         .bus  = NULL,
 226         .pm   = &afiucv_pm_ops,
 227 };
 228
 229 /* dummy device used as trigger for PM functions */
 230 static struct device *af_iucv_dev;
 231
 232 /**
 233  * iucv_msg_length() - Returns the length of an iucv message.
 234  * @msg:        Pointer to struct iucv_message, MUST NOT be NULL
 235  *
 236  * The function returns the length of the specified iucv message @msg of data
 237  * stored in a buffer and of data stored in the parameter list (PRMDATA).
 238  *
 239  * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
 240  * data:
 241  *      PRMDATA[0..6]   socket data (max 7 bytes);
 242  *      PRMDATA[7]      socket data length value (len is 0xff - PRMDATA[7])
 243  *
 244  * The socket data length is computed by subtracting the socket data length
 245  * value from 0xFF.
 246  * If the socket data len is greater 7, then PRMDATA can be used for special
 247  * notifications (see iucv_sock_shutdown); and further,
 248  * if the socket data len is > 7, the function returns 8.
 249  *
 250  * Use this function to allocate socket buffers to store iucv message data.
 251  */
 252 static inline size_t iucv_msg_length(struct iucv_message *msg)
 253 {
 254         size_t datalen;
 255
 256         if (msg->flags & IUCV_IPRMDATA) {
 257                 datalen = 0xff - msg->rmmsg[7];
 258                 return (datalen < 8) ? datalen : 8;
 259         }
 260         return msg->length;
 261 }
 262
 263 /**
 264  * iucv_sock_in_state() - check for specific states
 265  * @sk:         sock structure
 266  * @state:      first iucv sk state
 267  * @state:      second iucv sk state
 268  *
 269  * Returns true if the socket in either in the first or second state.
 270  */
 271 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
 272 {
 273         return (sk->sk_state == state || sk->sk_state == state2);
 274 }
 275
 276 /**
 277  * iucv_below_msglim() - function to check if messages can be sent
 278  * @sk:         sock structure
 279  *
 280  * Returns true if the send queue length is lower than the message limit.
 281  * Always returns true if the socket is not connected (no iucv path for
 282  * checking the message limit).
 283  */
 284 static inline int iucv_below_msglim(struct sock *sk)
 285 {
 286         struct iucv_sock *iucv = iucv_sk(sk);
 287
 288         if (sk->sk_state != IUCV_CONNECTED)
 289                 return 1;
 290         if (iucv->transport == AF_IUCV_TRANS_IUCV)
 291                 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
 292         else
 293                 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
 294                         (atomic_read(&iucv->pendings) <= 0));
 295 }
 296
 297 /**
 298  * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
 299  */
 300 static void iucv_sock_wake_msglim(struct sock *sk)
 301 {
 302         struct socket_wq *wq;
 303
 304         rcu_read_lock();
 305         wq = rcu_dereference(sk->sk_wq);
 306         if (wq_has_sleeper(wq))
 307                 wake_up_interruptible_all(&wq->wait);
 308         sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 309         rcu_read_unlock();
 310 }
 311
 312 /**
 313  * afiucv_hs_send() - send a message through HiperSockets transport
 314  */
 315 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
 316                    struct sk_buff *skb, u8 flags)
 317 {
 318         struct iucv_sock *iucv = iucv_sk(sock);
 319         struct af_iucv_trans_hdr *phs_hdr;
 320         struct sk_buff *nskb;
 321         int err, confirm_recv = 0;
 322
 323         memset(skb->head, 0, ETH_HLEN);
 324         phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
 325                                         sizeof(struct af_iucv_trans_hdr));
 326         skb_reset_mac_header(skb);
 327         skb_reset_network_header(skb);
 328         skb_push(skb, ETH_HLEN);
 329         skb_reset_mac_header(skb);
 330         memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
 331
 332         phs_hdr->magic = ETH_P_AF_IUCV;
 333         phs_hdr->version = 1;
 334         phs_hdr->flags = flags;
 335         if (flags == AF_IUCV_FLAG_SYN)
 336                 phs_hdr->window = iucv->msglimit;
 337         else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
 338                 confirm_recv = atomic_read(&iucv->msg_recv);
 339                 phs_hdr->window = confirm_recv;
 340                 if (confirm_recv)
 341                         phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
 342         }
 343         memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
 344         memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
 345         memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
 346         memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
 347         ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
 348         ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
 349         ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
 350         ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
 351         if (imsg)
 352                 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
 353
 354         skb->dev = iucv->hs_dev;
 355         if (!skb->dev)
 356                 return -ENODEV;
 357         if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
 358                 return -ENETDOWN;
 359         if (skb->len > skb->dev->mtu) {
 360                 if (sock->sk_type == SOCK_SEQPACKET)
 361                         return -EMSGSIZE;
 362                 else
 363                         skb_trim(skb, skb->dev->mtu);
 364         }
 365         skb->protocol = ETH_P_AF_IUCV;
 366         nskb = skb_clone(skb, GFP_ATOMIC);
 367         if (!nskb)
 368                 return -ENOMEM;
 369         skb_queue_tail(&iucv->send_skb_q, nskb);
 370         err = dev_queue_xmit(skb);
 371         if (net_xmit_eval(err)) {
 372                 skb_unlink(nskb, &iucv->send_skb_q);
 373                 kfree_skb(nskb);
 374         } else {
 375                 atomic_sub(confirm_recv, &iucv->msg_recv);
 376                 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
 377         }
 378         return net_xmit_eval(err);
 379 }
 380
 381 static struct sock *__iucv_get_sock_by_name(char *nm)
 382 {
 383         struct sock *sk;
 384
 385         sk_for_each(sk, &iucv_sk_list.head)
 386                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 387                         return sk;
 388
 389         return NULL;
 390 }
 391
 392 static void iucv_sock_destruct(struct sock *sk)
 393 {
 394         skb_queue_purge(&sk->sk_receive_queue);
 395         skb_queue_purge(&sk->sk_error_queue);
 396
 397         sk_mem_reclaim(sk);
 398
 399         if (!sock_flag(sk, SOCK_DEAD)) {
 400                 pr_err("Attempt to release alive iucv socket %p\n", sk);
 401                 return;
 402         }
 403
 404         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 405         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 406         WARN_ON(sk->sk_wmem_queued);
 407         WARN_ON(sk->sk_forward_alloc);
 408 }
 409
 410 /* Cleanup Listen */
 411 static void iucv_sock_cleanup_listen(struct sock *parent)
 412 {
 413         struct sock *sk;
 414
 415         /* Close non-accepted connections */
 416         while ((sk = iucv_accept_dequeue(parent, NULL))) {
 417                 iucv_sock_close(sk);
 418                 iucv_sock_kill(sk);
 419         }
 420
 421         parent->sk_state = IUCV_CLOSED;
 422 }
 423
 424 /* Kill socket (only if zapped and orphaned) */
 425 static void iucv_sock_kill(struct sock *sk)
 426 {
 427         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 428                 return;
 429
 430         iucv_sock_unlink(&iucv_sk_list, sk);
 431         sock_set_flag(sk, SOCK_DEAD);
 432         sock_put(sk);
 433 }
 434
 435 /* Terminate an IUCV path */
 436 static void iucv_sever_path(struct sock *sk, int with_user_data)
 437 {
 438         unsigned char user_data[16];
 439         struct iucv_sock *iucv = iucv_sk(sk);
 440         struct iucv_path *path = iucv->path;
 441
 442         if (iucv->path) {
 443                 iucv->path = NULL;
 444                 if (with_user_data) {
 445                         low_nmcpy(user_data, iucv->src_name);
 446                         high_nmcpy(user_data, iucv->dst_name);
 447                         ASCEBC(user_data, sizeof(user_data));
 448                         pr_iucv->path_sever(path, user_data);
 449                 } else
 450                         pr_iucv->path_sever(path, NULL);
 451                 iucv_path_free(path);
 452         }
 453 }
 454
 455 /* Send FIN through an IUCV socket for HIPER transport */
 456 static int iucv_send_ctrl(struct sock *sk, u8 flags)
 457 {
 458         int err = 0;
 459         int blen;
 460         struct sk_buff *skb;
 461
 462         blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
 463         skb = sock_alloc_send_skb(sk, blen, 1, &err);
 464         if (skb) {
 465                 skb_reserve(skb, blen);
 466                 err = afiucv_hs_send(NULL, sk, skb, flags);
 467         }
 468         return err;
 469 }
 470
 471 /* Close an IUCV socket */
 472 static void iucv_sock_close(struct sock *sk)
 473 {
 474         struct iucv_sock *iucv = iucv_sk(sk);
 475         unsigned long timeo;
 476         int err = 0;
 477
 478         lock_sock(sk);
 479
 480         switch (sk->sk_state) {
 481         case IUCV_LISTEN:
 482                 iucv_sock_cleanup_listen(sk);
 483                 break;
 484
 485         case IUCV_CONNECTED:
 486                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
 487                         err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
 488                         sk->sk_state = IUCV_DISCONN;
 489                         sk->sk_state_change(sk);
 490                 }
 491         case IUCV_DISCONN:   /* fall through */
 492                 sk->sk_state = IUCV_CLOSING;
 493                 sk->sk_state_change(sk);
 494
 495                 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
 496                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 497                                 timeo = sk->sk_lingertime;
 498                         else
 499                                 timeo = IUCV_DISCONN_TIMEOUT;
 500                         iucv_sock_wait(sk,
 501                                         iucv_sock_in_state(sk, IUCV_CLOSED, 0),
 502                                         timeo);
 503                 }
 504
 505         case IUCV_CLOSING:   /* fall through */
 506                 sk->sk_state = IUCV_CLOSED;
 507                 sk->sk_state_change(sk);
 508
 509                 sk->sk_err = ECONNRESET;
 510                 sk->sk_state_change(sk);
 511
 512                 skb_queue_purge(&iucv->send_skb_q);
 513                 skb_queue_purge(&iucv->backlog_skb_q);
 514
 515         default:   /* fall through */
 516                 iucv_sever_path(sk, 1);
 517         }
 518
 519         if (iucv->hs_dev) {
 520                 dev_put(iucv->hs_dev);
 521                 iucv->hs_dev = NULL;
 522                 sk->sk_bound_dev_if = 0;
 523         }
 524
 525         /* mark socket for deletion by iucv_sock_kill() */
 526         sock_set_flag(sk, SOCK_ZAPPED);
 527
 528         release_sock(sk);
 529 }
 530
 531 static void iucv_sock_init(struct sock *sk, struct sock *parent)
 532 {
 533         if (parent)
 534                 sk->sk_type = parent->sk_type;
 535 }
 536
 537 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
 538 {
 539         struct sock *sk;
 540         struct iucv_sock *iucv;
 541
 542         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
 543         if (!sk)
 544                 return NULL;
 545         iucv = iucv_sk(sk);
 546
 547         sock_init_data(sock, sk);
 548         INIT_LIST_HEAD(&iucv->accept_q);
 549         spin_lock_init(&iucv->accept_q_lock);
 550         skb_queue_head_init(&iucv->send_skb_q);
 551         INIT_LIST_HEAD(&iucv->message_q.list);
 552         spin_lock_init(&iucv->message_q.lock);
 553         skb_queue_head_init(&iucv->backlog_skb_q);
 554         iucv->send_tag = 0;
 555         atomic_set(&iucv->pendings, 0);
 556         iucv->flags = 0;
 557         iucv->msglimit = 0;
 558         atomic_set(&iucv->msg_sent, 0);
 559         atomic_set(&iucv->msg_recv, 0);
 560         iucv->path = NULL;
 561         iucv->sk_txnotify = afiucv_hs_callback_txnotify;
 562         memset(&iucv->src_user_id , 0, 32);
 563         if (pr_iucv)
 564                 iucv->transport = AF_IUCV_TRANS_IUCV;
 565         else
 566                 iucv->transport = AF_IUCV_TRANS_HIPER;
 567
 568         sk->sk_destruct = iucv_sock_destruct;
 569         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 570         sk->sk_allocation = GFP_DMA;
 571
 572         sock_reset_flag(sk, SOCK_ZAPPED);
 573
 574         sk->sk_protocol = proto;
 575         sk->sk_state    = IUCV_OPEN;
 576
 577         iucv_sock_link(&iucv_sk_list, sk);
 578         return sk;
 579 }
 580
 581 /* Create an IUCV socket */
 582 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
 583                             int kern)
 584 {
 585         struct sock *sk;
 586
 587         if (protocol && protocol != PF_IUCV)
 588                 return -EPROTONOSUPPORT;
 589
 590         sock->state = SS_UNCONNECTED;
 591
 592         switch (sock->type) {
 593         case SOCK_STREAM:
 594                 sock->ops = &iucv_sock_ops;
 595                 break;
 596         case SOCK_SEQPACKET:
 597                 /* currently, proto ops can handle both sk types */
 598                 sock->ops = &iucv_sock_ops;
 599                 break;
 600         default:
 601                 return -ESOCKTNOSUPPORT;
 602         }
 603
 604         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
 605         if (!sk)
 606                 return -ENOMEM;
 607
 608         iucv_sock_init(sk, NULL);
 609
 610         return 0;
 611 }
 612
 613 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 614 {
 615         write_lock_bh(&l->lock);
 616         sk_add_node(sk, &l->head);
 617         write_unlock_bh(&l->lock);
 618 }
 619
 620 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 621 {
 622         write_lock_bh(&l->lock);
 623         sk_del_node_init(sk);
 624         write_unlock_bh(&l->lock);
 625 }
 626
 627 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 628 {
 629         unsigned long flags;
 630         struct iucv_sock *par = iucv_sk(parent);
 631
 632         sock_hold(sk);
 633         spin_lock_irqsave(&par->accept_q_lock, flags);
 634         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 635         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 636         iucv_sk(sk)->parent = parent;
 637         sk_acceptq_added(parent);
 638 }
 639
 640 void iucv_accept_unlink(struct sock *sk)
 641 {
 642         unsigned long flags;
 643         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 644
 645         spin_lock_irqsave(&par->accept_q_lock, flags);
 646         list_del_init(&iucv_sk(sk)->accept_q);
 647         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 648         sk_acceptq_removed(iucv_sk(sk)->parent);
 649         iucv_sk(sk)->parent = NULL;
 650         sock_put(sk);
 651 }
 652
 653 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 654 {
 655         struct iucv_sock *isk, *n;
 656         struct sock *sk;
 657
 658         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 659                 sk = (struct sock *) isk;
 660                 lock_sock(sk);
 661
 662                 if (sk->sk_state == IUCV_CLOSED) {
 663                         iucv_accept_unlink(sk);
 664                         release_sock(sk);
 665                         continue;
 666                 }
 667
 668                 if (sk->sk_state == IUCV_CONNECTED ||
 669                     sk->sk_state == IUCV_DISCONN ||
 670                     !newsock) {
 671                         iucv_accept_unlink(sk);
 672                         if (newsock)
 673                                 sock_graft(sk, newsock);
 674
 675                         release_sock(sk);
 676                         return sk;
 677                 }
 678
 679                 release_sock(sk);
 680         }
 681         return NULL;
 682 }
 683
 684 static void __iucv_auto_name(struct iucv_sock *iucv)
 685 {
 686         char name[12];
 687
 688         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 689         while (__iucv_get_sock_by_name(name)) {
 690                 sprintf(name, "%08x",
 691                         atomic_inc_return(&iucv_sk_list.autobind_name));
 692         }
 693         memcpy(iucv->src_name, name, 8);
 694 }
 695
 696 /* Bind an unbound socket */
 697 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 698                           int addr_len)
 699 {
 700         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 701         struct sock *sk = sock->sk;
 702         struct iucv_sock *iucv;
 703         int err = 0;
 704         struct net_device *dev;
 705         char uid[9];
 706
 707         /* Verify the input sockaddr */
 708         if (!addr || addr->sa_family != AF_IUCV)
 709                 return -EINVAL;
 710
 711         if (addr_len < sizeof(struct sockaddr_iucv))
 712                 return -EINVAL;
 713
 714         lock_sock(sk);
 715         if (sk->sk_state != IUCV_OPEN) {
 716                 err = -EBADFD;
 717                 goto done;
 718         }
 719
 720         write_lock_bh(&iucv_sk_list.lock);
 721
 722         iucv = iucv_sk(sk);
 723         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 724                 err = -EADDRINUSE;
 725                 goto done_unlock;
 726         }
 727         if (iucv->path)
 728                 goto done_unlock;
 729
 730         /* Bind the socket */
 731         if (pr_iucv)
 732                 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
 733                         goto vm_bind; /* VM IUCV transport */
 734
 735         /* try hiper transport */
 736         memcpy(uid, sa->siucv_user_id, sizeof(uid));
 737         ASCEBC(uid, 8);
 738         rcu_read_lock();
 739         for_each_netdev_rcu(&init_net, dev) {
 740                 if (!memcmp(dev->perm_addr, uid, 8)) {
 741                         memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
 742                         /* Check for unitialized siucv_name */
 743                         if (strncmp(sa->siucv_name, "        ", 8) == 0)
 744                                 __iucv_auto_name(iucv);
 745                         else
 746                                 memcpy(iucv->src_name, sa->siucv_name, 8);
 747                         sk->sk_bound_dev_if = dev->ifindex;
 748                         iucv->hs_dev = dev;
 749                         dev_hold(dev);
 750                         sk->sk_state = IUCV_BOUND;
 751                         iucv->transport = AF_IUCV_TRANS_HIPER;
 752                         if (!iucv->msglimit)
 753                                 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
 754                         rcu_read_unlock();
 755                         goto done_unlock;
 756                 }
 757         }
 758         rcu_read_unlock();
 759 vm_bind:
 760         if (pr_iucv) {
 761                 /* use local userid for backward compat */
 762                 memcpy(iucv->src_name, sa->siucv_name, 8);
 763                 memcpy(iucv->src_user_id, iucv_userid, 8);
 764                 sk->sk_state = IUCV_BOUND;
 765                 iucv->transport = AF_IUCV_TRANS_IUCV;
 766                 if (!iucv->msglimit)
 767                         iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 768                 goto done_unlock;
 769         }
 770         /* found no dev to bind */
 771         err = -ENODEV;
 772 done_unlock:
 773         /* Release the socket list lock */
 774         write_unlock_bh(&iucv_sk_list.lock);
 775 done:
 776         release_sock(sk);
 777         return err;
 778 }
 779
 780 /* Automatically bind an unbound socket */
 781 static int iucv_sock_autobind(struct sock *sk)
 782 {
 783         struct iucv_sock *iucv = iucv_sk(sk);
 784         int err = 0;
 785
 786         if (unlikely(!pr_iucv))
 787                 return -EPROTO;
 788
 789         memcpy(iucv->src_user_id, iucv_userid, 8);
 790
 791         write_lock_bh(&iucv_sk_list.lock);
 792         __iucv_auto_name(iucv);
 793         write_unlock_bh(&iucv_sk_list.lock);
 794
 795         if (!iucv->msglimit)
 796                 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 797
 798         return err;
 799 }
 800
 801 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
 802 {
 803         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 804         struct sock *sk = sock->sk;
 805         struct iucv_sock *iucv = iucv_sk(sk);
 806         unsigned char user_data[16];
 807         int err;
 808
 809         high_nmcpy(user_data, sa->siucv_name);
 810         low_nmcpy(user_data, iucv->src_name);
 811         ASCEBC(user_data, sizeof(user_data));
 812
 813         /* Create path. */
 814         iucv->path = iucv_path_alloc(iucv->msglimit,
 815                                      IUCV_IPRMDATA, GFP_KERNEL);
 816         if (!iucv->path) {
 817                 err = -ENOMEM;
 818                 goto done;
 819         }
 820         err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
 821                                     sa->siucv_user_id, NULL, user_data,
 822                                     sk);
 823         if (err) {
 824                 iucv_path_free(iucv->path);
 825                 iucv->path = NULL;
 826                 switch (err) {
 827                 case 0x0b:      /* Target communicator is not logged on */
 828                         err = -ENETUNREACH;
 829                         break;
 830                 case 0x0d:      /* Max connections for this guest exceeded */
 831                 case 0x0e:      /* Max connections for target guest exceeded */
 832                         err = -EAGAIN;
 833                         break;
 834                 case 0x0f:      /* Missing IUCV authorization */
 835                         err = -EACCES;
 836                         break;
 837                 default:
 838                         err = -ECONNREFUSED;
 839                         break;
 840                 }
 841         }
 842 done:
 843         return err;
 844 }
 845
 846 /* Connect an unconnected socket */
 847 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 848                              int alen, int flags)
 849 {
 850         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 851         struct sock *sk = sock->sk;
 852         struct iucv_sock *iucv = iucv_sk(sk);
 853         int err;
 854
 855         if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
 856                 return -EINVAL;
 857
 858         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 859                 return -EBADFD;
 860
 861         if (sk->sk_state == IUCV_OPEN &&
 862             iucv->transport == AF_IUCV_TRANS_HIPER)
 863                 return -EBADFD; /* explicit bind required */
 864
 865         if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
 866                 return -EINVAL;
 867
 868         if (sk->sk_state == IUCV_OPEN) {
 869                 err = iucv_sock_autobind(sk);
 870                 if (unlikely(err))
 871                         return err;
 872         }
 873
 874         lock_sock(sk);
 875
 876         /* Set the destination information */
 877         memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
 878         memcpy(iucv->dst_name, sa->siucv_name, 8);
 879
 880         if (iucv->transport == AF_IUCV_TRANS_HIPER)
 881                 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
 882         else
 883                 err = afiucv_path_connect(sock, addr);
 884         if (err)
 885                 goto done;
 886
 887         if (sk->sk_state != IUCV_CONNECTED)
 888                 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
 889                                                             IUCV_DISCONN),
 890                                      sock_sndtimeo(sk, flags & O_NONBLOCK));
 891
 892         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
 893                 err = -ECONNREFUSED;
 894
 895         if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
 896                 iucv_sever_path(sk, 0);
 897
 898 done:
 899         release_sock(sk);
 900         return err;
 901 }
 902
 903 /* Move a socket into listening state. */
 904 static int iucv_sock_listen(struct socket *sock, int backlog)
 905 {
 906         struct sock *sk = sock->sk;
 907         int err;
 908
 909         lock_sock(sk);
 910
 911         err = -EINVAL;
 912         if (sk->sk_state != IUCV_BOUND)
 913                 goto done;
 914
 915         if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
 916                 goto done;
 917
 918         sk->sk_max_ack_backlog = backlog;
 919         sk->sk_ack_backlog = 0;
 920         sk->sk_state = IUCV_LISTEN;
 921         err = 0;
 922
 923 done:
 924         release_sock(sk);
 925         return err;
 926 }
 927
 928 /* Accept a pending connection */
 929 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 930                             int flags)
 931 {
 932         DECLARE_WAITQUEUE(wait, current);
 933         struct sock *sk = sock->sk, *nsk;
 934         long timeo;
 935         int err = 0;
 936
 937         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 938
 939         if (sk->sk_state != IUCV_LISTEN) {
 940                 err = -EBADFD;
 941                 goto done;
 942         }
 943
 944         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 945
 946         /* Wait for an incoming connection */
 947         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 948         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 949                 set_current_state(TASK_INTERRUPTIBLE);
 950                 if (!timeo) {
 951                         err = -EAGAIN;
 952                         break;
 953                 }
 954
 955                 release_sock(sk);
 956                 timeo = schedule_timeout(timeo);
 957                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 958
 959                 if (sk->sk_state != IUCV_LISTEN) {
 960                         err = -EBADFD;
 961                         break;
 962                 }
 963
 964                 if (signal_pending(current)) {
 965                         err = sock_intr_errno(timeo);
 966                         break;
 967                 }
 968         }
 969
 970         set_current_state(TASK_RUNNING);
 971         remove_wait_queue(sk_sleep(sk), &wait);
 972
 973         if (err)
 974                 goto done;
 975
 976         newsock->state = SS_CONNECTED;
 977
 978 done:
 979         release_sock(sk);
 980         return err;
 981 }
 982
 983 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 984                              int *len, int peer)
 985 {
 986         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 987         struct sock *sk = sock->sk;
 988         struct iucv_sock *iucv = iucv_sk(sk);
 989
 990         addr->sa_family = AF_IUCV;
 991         *len = sizeof(struct sockaddr_iucv);
 992
 993         if (peer) {
 994                 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
 995                 memcpy(siucv->siucv_name, iucv->dst_name, 8);
 996         } else {
 997                 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
 998                 memcpy(siucv->siucv_name, iucv->src_name, 8);
 999         }
1000         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1001         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1002         memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1003
1004         return 0;
1005 }
1006
1007 /**
1008  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1009  * @path:       IUCV path
1010  * @msg:        Pointer to a struct iucv_message
1011  * @skb:        The socket data to send, skb->len MUST BE <= 7
1012  *
1013  * Send the socket data in the parameter list in the iucv message
1014  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1015  * list and the socket data len at index 7 (last byte).
1016  * See also iucv_msg_length().
1017  *
1018  * Returns the error code from the iucv_message_send() call.
1019  */
1020 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1021                           struct sk_buff *skb)
1022 {
1023         u8 prmdata[8];
1024
1025         memcpy(prmdata, (void *) skb->data, skb->len);
1026         prmdata[7] = 0xff - (u8) skb->len;
1027         return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1028                                  (void *) prmdata, 8);
1029 }
1030
1031 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1032                              size_t len)
1033 {
1034         struct sock *sk = sock->sk;
1035         struct iucv_sock *iucv = iucv_sk(sk);
1036         struct sk_buff *skb;
1037         struct iucv_message txmsg;
1038         struct cmsghdr *cmsg;
1039         int cmsg_done;
1040         long timeo;
1041         char user_id[9];
1042         char appl_id[9];
1043         int err;
1044         int noblock = msg->msg_flags & MSG_DONTWAIT;
1045
1046         err = sock_error(sk);
1047         if (err)
1048                 return err;
1049
1050         if (msg->msg_flags & MSG_OOB)
1051                 return -EOPNOTSUPP;
1052
1053         /* SOCK_SEQPACKET: we do not support segmented records */
1054         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1055                 return -EOPNOTSUPP;
1056
1057         lock_sock(sk);
1058
1059         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1060                 err = -EPIPE;
1061                 goto out;
1062         }
1063
1064         /* Return if the socket is not in connected state */
1065         if (sk->sk_state != IUCV_CONNECTED) {
1066                 err = -ENOTCONN;
1067                 goto out;
1068         }
1069
1070         /* initialize defaults */
1071         cmsg_done   = 0;        /* check for duplicate headers */
1072         txmsg.class = 0;
1073
1074         /* iterate over control messages */
1075         for_each_cmsghdr(cmsg, msg) {
1076                 if (!CMSG_OK(msg, cmsg)) {
1077                         err = -EINVAL;
1078                         goto out;
1079                 }
1080
1081                 if (cmsg->cmsg_level != SOL_IUCV)
1082                         continue;
1083
1084                 if (cmsg->cmsg_type & cmsg_done) {
1085                         err = -EINVAL;
1086                         goto out;
1087                 }
1088                 cmsg_done |= cmsg->cmsg_type;
1089
1090                 switch (cmsg->cmsg_type) {
1091                 case SCM_IUCV_TRGCLS:
1092                         if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1093                                 err = -EINVAL;
1094                                 goto out;
1095                         }
1096
1097                         /* set iucv message target class */
1098                         memcpy(&txmsg.class,
1099                                 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1100
1101                         break;
1102
1103                 default:
1104                         err = -EINVAL;
1105                         goto out;
1106                 }
1107         }
1108
1109         /* allocate one skb for each iucv message:
1110          * this is fine for SOCK_SEQPACKET (unless we want to support
1111          * segmented records using the MSG_EOR flag), but
1112          * for SOCK_STREAM we might want to improve it in future */
1113         if (iucv->transport == AF_IUCV_TRANS_HIPER)
1114                 skb = sock_alloc_send_skb(sk,
1115                         len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1116                         noblock, &err);
1117         else
1118                 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1119         if (!skb)
1120                 goto out;
1121         if (iucv->transport == AF_IUCV_TRANS_HIPER)
1122                 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1123         if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1124                 err = -EFAULT;
1125                 goto fail;
1126         }
1127
1128         /* wait if outstanding messages for iucv path has reached */
1129         timeo = sock_sndtimeo(sk, noblock);
1130         err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1131         if (err)
1132                 goto fail;
1133
1134         /* return -ECONNRESET if the socket is no longer connected */
1135         if (sk->sk_state != IUCV_CONNECTED) {
1136                 err = -ECONNRESET;
1137                 goto fail;
1138         }
1139
1140         /* increment and save iucv message tag for msg_completion cbk */
1141         txmsg.tag = iucv->send_tag++;
1142         IUCV_SKB_CB(skb)->tag = txmsg.tag;
1143
1144         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1145                 atomic_inc(&iucv->msg_sent);
1146                 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1147                 if (err) {
1148                         atomic_dec(&iucv->msg_sent);
1149                         goto fail;
1150                 }
1151                 goto release;
1152         }
1153         skb_queue_tail(&iucv->send_skb_q, skb);
1154
1155         if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1156               && skb->len <= 7) {
1157                 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1158
1159                 /* on success: there is no message_complete callback
1160                  * for an IPRMDATA msg; remove skb from send queue */
1161                 if (err == 0) {
1162                         skb_unlink(skb, &iucv->send_skb_q);
1163                         kfree_skb(skb);
1164                 }
1165
1166                 /* this error should never happen since the
1167                  * IUCV_IPRMDATA path flag is set... sever path */
1168                 if (err == 0x15) {
1169                         pr_iucv->path_sever(iucv->path, NULL);
1170                         skb_unlink(skb, &iucv->send_skb_q);
1171                         err = -EPIPE;
1172                         goto fail;
1173                 }
1174         } else
1175                 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1176                                         (void *) skb->data, skb->len);
1177         if (err) {
1178                 if (err == 3) {
1179                         user_id[8] = 0;
1180                         memcpy(user_id, iucv->dst_user_id, 8);
1181                         appl_id[8] = 0;
1182                         memcpy(appl_id, iucv->dst_name, 8);
1183                         pr_err("Application %s on z/VM guest %s"
1184                                 " exceeds message limit\n",
1185                                 appl_id, user_id);
1186                         err = -EAGAIN;
1187                 } else
1188                         err = -EPIPE;
1189                 skb_unlink(skb, &iucv->send_skb_q);
1190                 goto fail;
1191         }
1192
1193 release:
1194         release_sock(sk);
1195         return len;
1196
1197 fail:
1198         kfree_skb(skb);
1199 out:
1200         release_sock(sk);
1201         return err;
1202 }
1203
1204 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1205  *
1206  * Locking: must be called with message_q.lock held
1207  */
1208 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1209 {
1210         int dataleft, size, copied = 0;
1211         struct sk_buff *nskb;
1212
1213         dataleft = len;
1214         while (dataleft) {
1215                 if (dataleft >= sk->sk_rcvbuf / 4)
1216                         size = sk->sk_rcvbuf / 4;
1217                 else
1218                         size = dataleft;
1219
1220                 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1221                 if (!nskb)
1222                         return -ENOMEM;
1223
1224                 /* copy target class to control buffer of new skb */
1225                 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
1226
1227                 /* copy data fragment */
1228                 memcpy(nskb->data, skb->data + copied, size);
1229                 copied += size;
1230                 dataleft -= size;
1231
1232                 skb_reset_transport_header(nskb);
1233                 skb_reset_network_header(nskb);
1234                 nskb->len = size;
1235
1236                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1237         }
1238
1239         return 0;
1240 }
1241
1242 /* iucv_process_message() - Receive a single outstanding IUCV message
1243  *
1244  * Locking: must be called with message_q.lock held
1245  */
1246 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1247                                  struct iucv_path *path,
1248                                  struct iucv_message *msg)
1249 {
1250         int rc;
1251         unsigned int len;
1252
1253         len = iucv_msg_length(msg);
1254
1255         /* store msg target class in the second 4 bytes of skb ctrl buffer */
1256         /* Note: the first 4 bytes are reserved for msg tag */
1257         IUCV_SKB_CB(skb)->class = msg->class;
1258
1259         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1260         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1261                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1262                         skb->data = NULL;
1263                         skb->len = 0;
1264                 }
1265         } else {
1266                 rc = pr_iucv->message_receive(path, msg,
1267                                               msg->flags & IUCV_IPRMDATA,
1268                                               skb->data, len, NULL);
1269                 if (rc) {
1270                         kfree_skb(skb);
1271                         return;
1272                 }
1273                 /* we need to fragment iucv messages for SOCK_STREAM only;
1274                  * for SOCK_SEQPACKET, it is only relevant if we support
1275                  * record segmentation using MSG_EOR (see also recvmsg()) */
1276                 if (sk->sk_type == SOCK_STREAM &&
1277                     skb->truesize >= sk->sk_rcvbuf / 4) {
1278                         rc = iucv_fragment_skb(sk, skb, len);
1279                         kfree_skb(skb);
1280                         skb = NULL;
1281                         if (rc) {
1282                                 pr_iucv->path_sever(path, NULL);
1283                                 return;
1284                         }
1285                         skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1286                 } else {
1287                         skb_reset_transport_header(skb);
1288                         skb_reset_network_header(skb);
1289                         skb->len = len;
1290                 }
1291         }
1292
1293         IUCV_SKB_CB(skb)->offset = 0;
1294         if (sock_queue_rcv_skb(sk, skb))
1295                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1296 }
1297
1298 /* iucv_process_message_q() - Process outstanding IUCV messages
1299  *
1300  * Locking: must be called with message_q.lock held
1301  */
1302 static void iucv_process_message_q(struct sock *sk)
1303 {
1304         struct iucv_sock *iucv = iucv_sk(sk);
1305         struct sk_buff *skb;
1306         struct sock_msg_q *p, *n;
1307
1308         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1309                 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1310                 if (!skb)
1311                         break;
1312                 iucv_process_message(sk, skb, p->path, &p->msg);
1313                 list_del(&p->list);
1314                 kfree(p);
1315                 if (!skb_queue_empty(&iucv->backlog_skb_q))
1316                         break;
1317         }
1318 }
1319
1320 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1321                              size_t len, int flags)
1322 {
1323         int noblock = flags & MSG_DONTWAIT;
1324         struct sock *sk = sock->sk;
1325         struct iucv_sock *iucv = iucv_sk(sk);
1326         unsigned int copied, rlen;
1327         struct sk_buff *skb, *rskb, *cskb;
1328         int err = 0;
1329         u32 offset;
1330
1331         if ((sk->sk_state == IUCV_DISCONN) &&
1332             skb_queue_empty(&iucv->backlog_skb_q) &&
1333             skb_queue_empty(&sk->sk_receive_queue) &&
1334             list_empty(&iucv->message_q.list))
1335                 return 0;
1336
1337         if (flags & (MSG_OOB))
1338                 return -EOPNOTSUPP;
1339
1340         /* receive/dequeue next skb:
1341          * the function understands MSG_PEEK and, thus, does not dequeue skb */
1342         skb = skb_recv_datagram(sk, flags, noblock, &err);
1343         if (!skb) {
1344                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1345                         return 0;
1346                 return err;
1347         }
1348
1349         offset = IUCV_SKB_CB(skb)->offset;
1350         rlen   = skb->len - offset;             /* real length of skb */
1351         copied = min_t(unsigned int, rlen, len);
1352         if (!rlen)
1353                 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1354
1355         cskb = skb;
1356         if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1357                 if (!(flags & MSG_PEEK))
1358                         skb_queue_head(&sk->sk_receive_queue, skb);
1359                 return -EFAULT;
1360         }
1361
1362         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1363         if (sk->sk_type == SOCK_SEQPACKET) {
1364                 if (copied < rlen)
1365                         msg->msg_flags |= MSG_TRUNC;
1366                 /* each iucv message contains a complete record */
1367                 msg->msg_flags |= MSG_EOR;
1368         }
1369
1370         /* create control message to store iucv msg target class:
1371          * get the trgcls from the control buffer of the skb due to
1372          * fragmentation of original iucv message. */
1373         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1374                        sizeof(IUCV_SKB_CB(skb)->class),
1375                        (void *)&IUCV_SKB_CB(skb)->class);
1376         if (err) {
1377                 if (!(flags & MSG_PEEK))
1378                         skb_queue_head(&sk->sk_receive_queue, skb);
1379                 return err;
1380         }
1381
1382         /* Mark read part of skb as used */
1383         if (!(flags & MSG_PEEK)) {
1384
1385                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1386                 if (sk->sk_type == SOCK_STREAM) {
1387                         if (copied < rlen) {
1388                                 IUCV_SKB_CB(skb)->offset = offset + copied;
1389                                 skb_queue_head(&sk->sk_receive_queue, skb);
1390                                 goto done;
1391                         }
1392                 }
1393
1394                 kfree_skb(skb);
1395                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1396                         atomic_inc(&iucv->msg_recv);
1397                         if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1398                                 WARN_ON(1);
1399                                 iucv_sock_close(sk);
1400                                 return -EFAULT;
1401                         }
1402                 }
1403
1404                 /* Queue backlog skbs */
1405                 spin_lock_bh(&iucv->message_q.lock);
1406                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1407                 while (rskb) {
1408                         IUCV_SKB_CB(rskb)->offset = 0;
1409                         if (sock_queue_rcv_skb(sk, rskb)) {
1410                                 skb_queue_head(&iucv->backlog_skb_q,
1411                                                 rskb);
1412                                 break;
1413                         } else {
1414                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1415                         }
1416                 }
1417                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1418                         if (!list_empty(&iucv->message_q.list))
1419                                 iucv_process_message_q(sk);
1420                         if (atomic_read(&iucv->msg_recv) >=
1421                                                         iucv->msglimit / 2) {
1422                                 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1423                                 if (err) {
1424                                         sk->sk_state = IUCV_DISCONN;
1425                                         sk->sk_state_change(sk);
1426                                 }
1427                         }
1428                 }
1429                 spin_unlock_bh(&iucv->message_q.lock);
1430         }
1431
1432 done:
1433         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1434         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1435                 copied = rlen;
1436
1437         return copied;
1438 }
1439
1440 static inline unsigned int iucv_accept_poll(struct sock *parent)
1441 {
1442         struct iucv_sock *isk, *n;
1443         struct sock *sk;
1444
1445         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1446                 sk = (struct sock *) isk;
1447
1448                 if (sk->sk_state == IUCV_CONNECTED)
1449                         return POLLIN | POLLRDNORM;
1450         }
1451
1452         return 0;
1453 }
1454
1455 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1456                             poll_table *wait)
1457 {
1458         struct sock *sk = sock->sk;
1459         unsigned int mask = 0;
1460
1461         sock_poll_wait(file, sk_sleep(sk), wait);
1462
1463         if (sk->sk_state == IUCV_LISTEN)
1464                 return iucv_accept_poll(sk);
1465
1466         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1467                 mask |= POLLERR |
1468                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1469
1470         if (sk->sk_shutdown & RCV_SHUTDOWN)
1471                 mask |= POLLRDHUP;
1472
1473         if (sk->sk_shutdown == SHUTDOWN_MASK)
1474                 mask |= POLLHUP;
1475
1476         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1477             (sk->sk_shutdown & RCV_SHUTDOWN))
1478                 mask |= POLLIN | POLLRDNORM;
1479
1480         if (sk->sk_state == IUCV_CLOSED)
1481                 mask |= POLLHUP;
1482
1483         if (sk->sk_state == IUCV_DISCONN)
1484                 mask |= POLLIN;
1485
1486         if (sock_writeable(sk) && iucv_below_msglim(sk))
1487                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1488         else
1489                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1490
1491         return mask;
1492 }
1493
1494 static int iucv_sock_shutdown(struct socket *sock, int how)
1495 {
1496         struct sock *sk = sock->sk;
1497         struct iucv_sock *iucv = iucv_sk(sk);
1498         struct iucv_message txmsg;
1499         int err = 0;
1500
1501         how++;
1502
1503         if ((how & ~SHUTDOWN_MASK) || !how)
1504                 return -EINVAL;
1505
1506         lock_sock(sk);
1507         switch (sk->sk_state) {
1508         case IUCV_LISTEN:
1509         case IUCV_DISCONN:
1510         case IUCV_CLOSING:
1511         case IUCV_CLOSED:
1512                 err = -ENOTCONN;
1513                 goto fail;
1514         default:
1515                 break;
1516         }
1517
1518         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1519                 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1520                         txmsg.class = 0;
1521                         txmsg.tag = 0;
1522                         err = pr_iucv->message_send(iucv->path, &txmsg,
1523                                 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1524                         if (err) {
1525                                 switch (err) {
1526                                 case 1:
1527                                         err = -ENOTCONN;
1528                                         break;
1529                                 case 2:
1530                                         err = -ECONNRESET;
1531                                         break;
1532                                 default:
1533                                         err = -ENOTCONN;
1534                                         break;
1535                                 }
1536                         }
1537                 } else
1538                         iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1539         }
1540
1541         sk->sk_shutdown |= how;
1542         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1543                 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1544                     iucv->path) {
1545                         err = pr_iucv->path_quiesce(iucv->path, NULL);
1546                         if (err)
1547                                 err = -ENOTCONN;
1548 /*                      skb_queue_purge(&sk->sk_receive_queue); */
1549                 }
1550                 skb_queue_purge(&sk->sk_receive_queue);
1551         }
1552
1553         /* Wake up anyone sleeping in poll */
1554         sk->sk_state_change(sk);
1555
1556 fail:
1557         release_sock(sk);
1558         return err;
1559 }
1560
1561 static int iucv_sock_release(struct socket *sock)
1562 {
1563         struct sock *sk = sock->sk;
1564         int err = 0;
1565
1566         if (!sk)
1567                 return 0;
1568
1569         iucv_sock_close(sk);
1570
1571         sock_orphan(sk);
1572         iucv_sock_kill(sk);
1573         return err;
1574 }
1575
1576 /* getsockopt and setsockopt */
1577 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1578                                 char __user *optval, unsigned int optlen)
1579 {
1580         struct sock *sk = sock->sk;
1581         struct iucv_sock *iucv = iucv_sk(sk);
1582         int val;
1583         int rc;
1584
1585         if (level != SOL_IUCV)
1586                 return -ENOPROTOOPT;
1587
1588         if (optlen < sizeof(int))
1589                 return -EINVAL;
1590
1591         if (get_user(val, (int __user *) optval))
1592                 return -EFAULT;
1593
1594         rc = 0;
1595
1596         lock_sock(sk);
1597         switch (optname) {
1598         case SO_IPRMDATA_MSG:
1599                 if (val)
1600                         iucv->flags |= IUCV_IPRMDATA;
1601                 else
1602                         iucv->flags &= ~IUCV_IPRMDATA;
1603                 break;
1604         case SO_MSGLIMIT:
1605                 switch (sk->sk_state) {
1606                 case IUCV_OPEN:
1607                 case IUCV_BOUND:
1608                         if (val < 1 || val > (u16)(~0))
1609                                 rc = -EINVAL;
1610                         else
1611                                 iucv->msglimit = val;
1612                         break;
1613                 default:
1614                         rc = -EINVAL;
1615                         break;
1616                 }
1617                 break;
1618         default:
1619                 rc = -ENOPROTOOPT;
1620                 break;
1621         }
1622         release_sock(sk);
1623
1624         return rc;
1625 }
1626
1627 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1628                                 char __user *optval, int __user *optlen)
1629 {
1630         struct sock *sk = sock->sk;
1631         struct iucv_sock *iucv = iucv_sk(sk);
1632         unsigned int val;
1633         int len;
1634
1635         if (level != SOL_IUCV)
1636                 return -ENOPROTOOPT;
1637
1638         if (get_user(len, optlen))
1639                 return -EFAULT;
1640
1641         if (len < 0)
1642                 return -EINVAL;
1643
1644         len = min_t(unsigned int, len, sizeof(int));
1645
1646         switch (optname) {
1647         case SO_IPRMDATA_MSG:
1648                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1649                 break;
1650         case SO_MSGLIMIT:
1651                 lock_sock(sk);
1652                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1653                                            : iucv->msglimit;    /* default */
1654                 release_sock(sk);
1655                 break;
1656         case SO_MSGSIZE:
1657                 if (sk->sk_state == IUCV_OPEN)
1658                         return -EBADFD;
1659                 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1660                                 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1661                                 0x7fffffff;
1662                 break;
1663         default:
1664                 return -ENOPROTOOPT;
1665         }
1666
1667         if (put_user(len, optlen))
1668                 return -EFAULT;
1669         if (copy_to_user(optval, &val, len))
1670                 return -EFAULT;
1671
1672         return 0;
1673 }
1674
1675
1676 /* Callback wrappers - called from iucv base support */
1677 static int iucv_callback_connreq(struct iucv_path *path,
1678                                  u8 ipvmid[8], u8 ipuser[16])
1679 {
1680         unsigned char user_data[16];
1681         unsigned char nuser_data[16];
1682         unsigned char src_name[8];
1683         struct sock *sk, *nsk;
1684         struct iucv_sock *iucv, *niucv;
1685         int err;
1686
1687         memcpy(src_name, ipuser, 8);
1688         EBCASC(src_name, 8);
1689         /* Find out if this path belongs to af_iucv. */
1690         read_lock(&iucv_sk_list.lock);
1691         iucv = NULL;
1692         sk = NULL;
1693         sk_for_each(sk, &iucv_sk_list.head)
1694                 if (sk->sk_state == IUCV_LISTEN &&
1695                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1696                         /*
1697                          * Found a listening socket with
1698                          * src_name == ipuser[0-7].
1699                          */
1700                         iucv = iucv_sk(sk);
1701                         break;
1702                 }
1703         read_unlock(&iucv_sk_list.lock);
1704         if (!iucv)
1705                 /* No socket found, not one of our paths. */
1706                 return -EINVAL;
1707
1708         bh_lock_sock(sk);
1709
1710         /* Check if parent socket is listening */
1711         low_nmcpy(user_data, iucv->src_name);
1712         high_nmcpy(user_data, iucv->dst_name);
1713         ASCEBC(user_data, sizeof(user_data));
1714         if (sk->sk_state != IUCV_LISTEN) {
1715                 err = pr_iucv->path_sever(path, user_data);
1716                 iucv_path_free(path);
1717                 goto fail;
1718         }
1719
1720         /* Check for backlog size */
1721         if (sk_acceptq_is_full(sk)) {
1722                 err = pr_iucv->path_sever(path, user_data);
1723                 iucv_path_free(path);
1724                 goto fail;
1725         }
1726
1727         /* Create the new socket */
1728         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1729         if (!nsk) {
1730                 err = pr_iucv->path_sever(path, user_data);
1731                 iucv_path_free(path);
1732                 goto fail;
1733         }
1734
1735         niucv = iucv_sk(nsk);
1736         iucv_sock_init(nsk, sk);
1737
1738         /* Set the new iucv_sock */
1739         memcpy(niucv->dst_name, ipuser + 8, 8);
1740         EBCASC(niucv->dst_name, 8);
1741         memcpy(niucv->dst_user_id, ipvmid, 8);
1742         memcpy(niucv->src_name, iucv->src_name, 8);
1743         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1744         niucv->path = path;
1745
1746         /* Call iucv_accept */
1747         high_nmcpy(nuser_data, ipuser + 8);
1748         memcpy(nuser_data + 8, niucv->src_name, 8);
1749         ASCEBC(nuser_data + 8, 8);
1750
1751         /* set message limit for path based on msglimit of accepting socket */
1752         niucv->msglimit = iucv->msglimit;
1753         path->msglim = iucv->msglimit;
1754         err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1755         if (err) {
1756                 iucv_sever_path(nsk, 1);
1757                 iucv_sock_kill(nsk);
1758                 goto fail;
1759         }
1760
1761         iucv_accept_enqueue(sk, nsk);
1762
1763         /* Wake up accept */
1764         nsk->sk_state = IUCV_CONNECTED;
1765         sk->sk_data_ready(sk);
1766         err = 0;
1767 fail:
1768         bh_unlock_sock(sk);
1769         return 0;
1770 }
1771
1772 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1773 {
1774         struct sock *sk = path->private;
1775
1776         sk->sk_state = IUCV_CONNECTED;
1777         sk->sk_state_change(sk);
1778 }
1779
1780 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1781 {
1782         struct sock *sk = path->private;
1783         struct iucv_sock *iucv = iucv_sk(sk);
1784         struct sk_buff *skb;
1785         struct sock_msg_q *save_msg;
1786         int len;
1787
1788         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1789                 pr_iucv->message_reject(path, msg);
1790                 return;
1791         }
1792
1793         spin_lock(&iucv->message_q.lock);
1794
1795         if (!list_empty(&iucv->message_q.list) ||
1796             !skb_queue_empty(&iucv->backlog_skb_q))
1797                 goto save_message;
1798
1799         len = atomic_read(&sk->sk_rmem_alloc);
1800         len += SKB_TRUESIZE(iucv_msg_length(msg));
1801         if (len > sk->sk_rcvbuf)
1802                 goto save_message;
1803
1804         skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1805         if (!skb)
1806                 goto save_message;
1807
1808         iucv_process_message(sk, skb, path, msg);
1809         goto out_unlock;
1810
1811 save_message:
1812         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1813         if (!save_msg)
1814                 goto out_unlock;
1815         save_msg->path = path;
1816         save_msg->msg = *msg;
1817
1818         list_add_tail(&save_msg->list, &iucv->message_q.list);
1819
1820 out_unlock:
1821         spin_unlock(&iucv->message_q.lock);
1822 }
1823
1824 static void iucv_callback_txdone(struct iucv_path *path,
1825                                  struct iucv_message *msg)
1826 {
1827         struct sock *sk = path->private;
1828         struct sk_buff *this = NULL;
1829         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1830         struct sk_buff *list_skb = list->next;
1831         unsigned long flags;
1832
1833         bh_lock_sock(sk);
1834         if (!skb_queue_empty(list)) {
1835                 spin_lock_irqsave(&list->lock, flags);
1836
1837                 while (list_skb != (struct sk_buff *)list) {
1838                         if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1839                                 this = list_skb;
1840                                 break;
1841                         }
1842                         list_skb = list_skb->next;
1843                 }
1844                 if (this)
1845                         __skb_unlink(this, list);
1846
1847                 spin_unlock_irqrestore(&list->lock, flags);
1848
1849                 if (this) {
1850                         kfree_skb(this);
1851                         /* wake up any process waiting for sending */
1852                         iucv_sock_wake_msglim(sk);
1853                 }
1854         }
1855
1856         if (sk->sk_state == IUCV_CLOSING) {
1857                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1858                         sk->sk_state = IUCV_CLOSED;
1859                         sk->sk_state_change(sk);
1860                 }
1861         }
1862         bh_unlock_sock(sk);
1863
1864 }
1865
1866 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1867 {
1868         struct sock *sk = path->private;
1869
1870         if (sk->sk_state == IUCV_CLOSED)
1871                 return;
1872
1873         bh_lock_sock(sk);
1874         iucv_sever_path(sk, 1);
1875         sk->sk_state = IUCV_DISCONN;
1876
1877         sk->sk_state_change(sk);
1878         bh_unlock_sock(sk);
1879 }
1880
1881 /* called if the other communication side shuts down its RECV direction;
1882  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1883  */
1884 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1885 {
1886         struct sock *sk = path->private;
1887
1888         bh_lock_sock(sk);
1889         if (sk->sk_state != IUCV_CLOSED) {
1890                 sk->sk_shutdown |= SEND_SHUTDOWN;
1891                 sk->sk_state_change(sk);
1892         }
1893         bh_unlock_sock(sk);
1894 }
1895
1896 /***************** HiperSockets transport callbacks ********************/
1897 static void afiucv_swap_src_dest(struct sk_buff *skb)
1898 {
1899         struct af_iucv_trans_hdr *trans_hdr =
1900                                 (struct af_iucv_trans_hdr *)skb->data;
1901         char tmpID[8];
1902         char tmpName[8];
1903
1904         ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1905         ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1906         ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1907         ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1908         memcpy(tmpID, trans_hdr->srcUserID, 8);
1909         memcpy(tmpName, trans_hdr->srcAppName, 8);
1910         memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1911         memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1912         memcpy(trans_hdr->destUserID, tmpID, 8);
1913         memcpy(trans_hdr->destAppName, tmpName, 8);
1914         skb_push(skb, ETH_HLEN);
1915         memset(skb->data, 0, ETH_HLEN);
1916 }
1917
1918 /**
1919  * afiucv_hs_callback_syn - react on received SYN
1920  **/
1921 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1922 {
1923         struct sock *nsk;
1924         struct iucv_sock *iucv, *niucv;
1925         struct af_iucv_trans_hdr *trans_hdr;
1926         int err;
1927
1928         iucv = iucv_sk(sk);
1929         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1930         if (!iucv) {
1931                 /* no sock - connection refused */
1932                 afiucv_swap_src_dest(skb);
1933                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1934                 err = dev_queue_xmit(skb);
1935                 goto out;
1936         }
1937
1938         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1939         bh_lock_sock(sk);
1940         if ((sk->sk_state != IUCV_LISTEN) ||
1941             sk_acceptq_is_full(sk) ||
1942             !nsk) {
1943                 /* error on server socket - connection refused */
1944                 afiucv_swap_src_dest(skb);
1945                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1946                 err = dev_queue_xmit(skb);
1947                 iucv_sock_kill(nsk);
1948                 bh_unlock_sock(sk);
1949                 goto out;
1950         }
1951
1952         niucv = iucv_sk(nsk);
1953         iucv_sock_init(nsk, sk);
1954         niucv->transport = AF_IUCV_TRANS_HIPER;
1955         niucv->msglimit = iucv->msglimit;
1956         if (!trans_hdr->window)
1957                 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1958         else
1959                 niucv->msglimit_peer = trans_hdr->window;
1960         memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1961         memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1962         memcpy(niucv->src_name, iucv->src_name, 8);
1963         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1964         nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1965         niucv->hs_dev = iucv->hs_dev;
1966         dev_hold(niucv->hs_dev);
1967         afiucv_swap_src_dest(skb);
1968         trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1969         trans_hdr->window = niucv->msglimit;
1970         /* if receiver acks the xmit connection is established */
1971         err = dev_queue_xmit(skb);
1972         if (!err) {
1973                 iucv_accept_enqueue(sk, nsk);
1974                 nsk->sk_state = IUCV_CONNECTED;
1975                 sk->sk_data_ready(sk);
1976         } else
1977                 iucv_sock_kill(nsk);
1978         bh_unlock_sock(sk);
1979
1980 out:
1981         return NET_RX_SUCCESS;
1982 }
1983
1984 /**
1985  * afiucv_hs_callback_synack() - react on received SYN-ACK
1986  **/
1987 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1988 {
1989         struct iucv_sock *iucv = iucv_sk(sk);
1990         struct af_iucv_trans_hdr *trans_hdr =
1991                                         (struct af_iucv_trans_hdr *)skb->data;
1992
1993         if (!iucv)
1994                 goto out;
1995         if (sk->sk_state != IUCV_BOUND)
1996                 goto out;
1997         bh_lock_sock(sk);
1998         iucv->msglimit_peer = trans_hdr->window;
1999         sk->sk_state = IUCV_CONNECTED;
2000         sk->sk_state_change(sk);
2001         bh_unlock_sock(sk);
2002 out:
2003         kfree_skb(skb);
2004         return NET_RX_SUCCESS;
2005 }
2006
2007 /**
2008  * afiucv_hs_callback_synfin() - react on received SYN_FIN
2009  **/
2010 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2011 {
2012         struct iucv_sock *iucv = iucv_sk(sk);
2013
2014         if (!iucv)
2015                 goto out;
2016         if (sk->sk_state != IUCV_BOUND)
2017                 goto out;
2018         bh_lock_sock(sk);
2019         sk->sk_state = IUCV_DISCONN;
2020         sk->sk_state_change(sk);
2021         bh_unlock_sock(sk);
2022 out:
2023         kfree_skb(skb);
2024         return NET_RX_SUCCESS;
2025 }
2026
2027 /**
2028  * afiucv_hs_callback_fin() - react on received FIN
2029  **/
2030 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2031 {
2032         struct iucv_sock *iucv = iucv_sk(sk);
2033
2034         /* other end of connection closed */
2035         if (!iucv)
2036                 goto out;
2037         bh_lock_sock(sk);
2038         if (sk->sk_state == IUCV_CONNECTED) {
2039                 sk->sk_state = IUCV_DISCONN;
2040                 sk->sk_state_change(sk);
2041         }
2042         bh_unlock_sock(sk);
2043 out:
2044         kfree_skb(skb);
2045         return NET_RX_SUCCESS;
2046 }
2047
2048 /**
2049  * afiucv_hs_callback_win() - react on received WIN
2050  **/
2051 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2052 {
2053         struct iucv_sock *iucv = iucv_sk(sk);
2054         struct af_iucv_trans_hdr *trans_hdr =
2055                                         (struct af_iucv_trans_hdr *)skb->data;
2056
2057         if (!iucv)
2058                 return NET_RX_SUCCESS;
2059
2060         if (sk->sk_state != IUCV_CONNECTED)
2061                 return NET_RX_SUCCESS;
2062
2063         atomic_sub(trans_hdr->window, &iucv->msg_sent);
2064         iucv_sock_wake_msglim(sk);
2065         return NET_RX_SUCCESS;
2066 }
2067
2068 /**
2069  * afiucv_hs_callback_rx() - react on received data
2070  **/
2071 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2072 {
2073         struct iucv_sock *iucv = iucv_sk(sk);
2074
2075         if (!iucv) {
2076                 kfree_skb(skb);
2077                 return NET_RX_SUCCESS;
2078         }
2079
2080         if (sk->sk_state != IUCV_CONNECTED) {
2081                 kfree_skb(skb);
2082                 return NET_RX_SUCCESS;
2083         }
2084
2085         if (sk->sk_shutdown & RCV_SHUTDOWN) {
2086                 kfree_skb(skb);
2087                 return NET_RX_SUCCESS;
2088         }
2089
2090                 /* write stuff from iucv_msg to skb cb */
2091         if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
2092                 kfree_skb(skb);
2093                 return NET_RX_SUCCESS;
2094         }
2095         skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2096         skb_reset_transport_header(skb);
2097         skb_reset_network_header(skb);
2098         IUCV_SKB_CB(skb)->offset = 0;
2099         spin_lock(&iucv->message_q.lock);
2100         if (skb_queue_empty(&iucv->backlog_skb_q)) {
2101                 if (sock_queue_rcv_skb(sk, skb)) {
2102                         /* handle rcv queue full */
2103                         skb_queue_tail(&iucv->backlog_skb_q, skb);
2104                 }
2105         } else
2106                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2107         spin_unlock(&iucv->message_q.lock);
2108         return NET_RX_SUCCESS;
2109 }
2110
2111 /**
2112  * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2113  *                   transport
2114  *                   called from netif RX softirq
2115  **/
2116 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2117         struct packet_type *pt, struct net_device *orig_dev)
2118 {
2119         struct sock *sk;
2120         struct iucv_sock *iucv;
2121         struct af_iucv_trans_hdr *trans_hdr;
2122         char nullstring[8];
2123         int err = 0;
2124
2125         skb_pull(skb, ETH_HLEN);
2126         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2127         EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2128         EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2129         EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2130         EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2131         memset(nullstring, 0, sizeof(nullstring));
2132         iucv = NULL;
2133         sk = NULL;
2134         read_lock(&iucv_sk_list.lock);
2135         sk_for_each(sk, &iucv_sk_list.head) {
2136                 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2137                         if ((!memcmp(&iucv_sk(sk)->src_name,
2138                                      trans_hdr->destAppName, 8)) &&
2139                             (!memcmp(&iucv_sk(sk)->src_user_id,
2140                                      trans_hdr->destUserID, 8)) &&
2141                             (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2142                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2143                                      nullstring, 8))) {
2144                                 iucv = iucv_sk(sk);
2145                                 break;
2146                         }
2147                 } else {
2148                         if ((!memcmp(&iucv_sk(sk)->src_name,
2149                                      trans_hdr->destAppName, 8)) &&
2150                             (!memcmp(&iucv_sk(sk)->src_user_id,
2151                                      trans_hdr->destUserID, 8)) &&
2152                             (!memcmp(&iucv_sk(sk)->dst_name,
2153                                      trans_hdr->srcAppName, 8)) &&
2154                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2155                                      trans_hdr->srcUserID, 8))) {
2156                                 iucv = iucv_sk(sk);
2157                                 break;
2158                         }
2159                 }
2160         }
2161         read_unlock(&iucv_sk_list.lock);
2162         if (!iucv)
2163                 sk = NULL;
2164
2165         /* no sock
2166         how should we send with no sock
2167         1) send without sock no send rc checking?
2168         2) introduce default sock to handle this cases
2169
2170          SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2171          data -> send FIN
2172          SYN|ACK, SYN|FIN, FIN -> no action? */
2173
2174         switch (trans_hdr->flags) {
2175         case AF_IUCV_FLAG_SYN:
2176                 /* connect request */
2177                 err = afiucv_hs_callback_syn(sk, skb);
2178                 break;
2179         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2180                 /* connect request confirmed */
2181                 err = afiucv_hs_callback_synack(sk, skb);
2182                 break;
2183         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2184                 /* connect request refused */
2185                 err = afiucv_hs_callback_synfin(sk, skb);
2186                 break;
2187         case (AF_IUCV_FLAG_FIN):
2188                 /* close request */
2189                 err = afiucv_hs_callback_fin(sk, skb);
2190                 break;
2191         case (AF_IUCV_FLAG_WIN):
2192                 err = afiucv_hs_callback_win(sk, skb);
2193                 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2194                         kfree_skb(skb);
2195                         break;
2196                 }
2197                 /* fall through and receive non-zero length data */
2198         case (AF_IUCV_FLAG_SHT):
2199                 /* shutdown request */
2200                 /* fall through and receive zero length data */
2201         case 0:
2202                 /* plain data frame */
2203                 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2204                 err = afiucv_hs_callback_rx(sk, skb);
2205                 break;
2206         default:
2207                 ;
2208         }
2209
2210         return err;
2211 }
2212
2213 /**
2214  * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2215  *                                 transport
2216  **/
2217 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2218                                         enum iucv_tx_notify n)
2219 {
2220         struct sock *isk = skb->sk;
2221         struct sock *sk = NULL;
2222         struct iucv_sock *iucv = NULL;
2223         struct sk_buff_head *list;
2224         struct sk_buff *list_skb;
2225         struct sk_buff *nskb;
2226         unsigned long flags;
2227
2228         read_lock_irqsave(&iucv_sk_list.lock, flags);
2229         sk_for_each(sk, &iucv_sk_list.head)
2230                 if (sk == isk) {
2231                         iucv = iucv_sk(sk);
2232                         break;
2233                 }
2234         read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2235
2236         if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2237                 return;
2238
2239         list = &iucv->send_skb_q;
2240         spin_lock_irqsave(&list->lock, flags);
2241         if (skb_queue_empty(list))
2242                 goto out_unlock;
2243         list_skb = list->next;
2244         nskb = list_skb->next;
2245         while (list_skb != (struct sk_buff *)list) {
2246                 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2247                         switch (n) {
2248                         case TX_NOTIFY_OK:
2249                                 __skb_unlink(list_skb, list);
2250                                 kfree_skb(list_skb);
2251                                 iucv_sock_wake_msglim(sk);
2252                                 break;
2253                         case TX_NOTIFY_PENDING:
2254                                 atomic_inc(&iucv->pendings);
2255                                 break;
2256                         case TX_NOTIFY_DELAYED_OK:
2257                                 __skb_unlink(list_skb, list);
2258                                 atomic_dec(&iucv->pendings);
2259                                 if (atomic_read(&iucv->pendings) <= 0)
2260                                         iucv_sock_wake_msglim(sk);
2261                                 kfree_skb(list_skb);
2262                                 break;
2263                         case TX_NOTIFY_UNREACHABLE:
2264                         case TX_NOTIFY_DELAYED_UNREACHABLE:
2265                         case TX_NOTIFY_TPQFULL: /* not yet used */
2266                         case TX_NOTIFY_GENERALERROR:
2267                         case TX_NOTIFY_DELAYED_GENERALERROR:
2268                                 __skb_unlink(list_skb, list);
2269                                 kfree_skb(list_skb);
2270                                 if (sk->sk_state == IUCV_CONNECTED) {
2271                                         sk->sk_state = IUCV_DISCONN;
2272                                         sk->sk_state_change(sk);
2273                                 }
2274                                 break;
2275                         }
2276                         break;
2277                 }
2278                 list_skb = nskb;
2279                 nskb = nskb->next;
2280         }
2281 out_unlock:
2282         spin_unlock_irqrestore(&list->lock, flags);
2283
2284         if (sk->sk_state == IUCV_CLOSING) {
2285                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2286                         sk->sk_state = IUCV_CLOSED;
2287                         sk->sk_state_change(sk);
2288                 }
2289         }
2290
2291 }
2292
2293 /*
2294  * afiucv_netdev_event: handle netdev notifier chain events
2295  */
2296 static int afiucv_netdev_event(struct notifier_block *this,
2297                                unsigned long event, void *ptr)
2298 {
2299         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2300         struct sock *sk;
2301         struct iucv_sock *iucv;
2302
2303         switch (event) {
2304         case NETDEV_REBOOT:
2305         case NETDEV_GOING_DOWN:
2306                 sk_for_each(sk, &iucv_sk_list.head) {
2307                         iucv = iucv_sk(sk);
2308                         if ((iucv->hs_dev == event_dev) &&
2309                             (sk->sk_state == IUCV_CONNECTED)) {
2310                                 if (event == NETDEV_GOING_DOWN)
2311                                         iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2312                                 sk->sk_state = IUCV_DISCONN;
2313                                 sk->sk_state_change(sk);
2314                         }
2315                 }
2316                 break;
2317         case NETDEV_DOWN:
2318         case NETDEV_UNREGISTER:
2319         default:
2320                 break;
2321         }
2322         return NOTIFY_DONE;
2323 }
2324
2325 static struct notifier_block afiucv_netdev_notifier = {
2326         .notifier_call = afiucv_netdev_event,
2327 };
2328
2329 static const struct proto_ops iucv_sock_ops = {
2330         .family         = PF_IUCV,
2331         .owner          = THIS_MODULE,
2332         .release        = iucv_sock_release,
2333         .bind           = iucv_sock_bind,
2334         .connect        = iucv_sock_connect,
2335         .listen         = iucv_sock_listen,
2336         .accept         = iucv_sock_accept,
2337         .getname        = iucv_sock_getname,
2338         .sendmsg        = iucv_sock_sendmsg,
2339         .recvmsg        = iucv_sock_recvmsg,
2340         .poll           = iucv_sock_poll,
2341         .ioctl          = sock_no_ioctl,
2342         .mmap           = sock_no_mmap,
2343         .socketpair     = sock_no_socketpair,
2344         .shutdown       = iucv_sock_shutdown,
2345         .setsockopt     = iucv_sock_setsockopt,
2346         .getsockopt     = iucv_sock_getsockopt,
2347 };
2348
2349 static const struct net_proto_family iucv_sock_family_ops = {
2350         .family = AF_IUCV,
2351         .owner  = THIS_MODULE,
2352         .create = iucv_sock_create,
2353 };
2354
2355 static struct packet_type iucv_packet_type = {
2356         .type = cpu_to_be16(ETH_P_AF_IUCV),
2357         .func = afiucv_hs_rcv,
2358 };
2359
2360 static int afiucv_iucv_init(void)
2361 {
2362         int err;
2363
2364         err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2365         if (err)
2366                 goto out;
2367         /* establish dummy device */
2368         af_iucv_driver.bus = pr_iucv->bus;
2369         err = driver_register(&af_iucv_driver);
2370         if (err)
2371                 goto out_iucv;
2372         af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2373         if (!af_iucv_dev) {
2374                 err = -ENOMEM;
2375                 goto out_driver;
2376         }
2377         dev_set_name(af_iucv_dev, "af_iucv");
2378         af_iucv_dev->bus = pr_iucv->bus;
2379         af_iucv_dev->parent = pr_iucv->root;
2380         af_iucv_dev->release = (void (*)(struct device *))kfree;
2381         af_iucv_dev->driver = &af_iucv_driver;
2382         err = device_register(af_iucv_dev);
2383         if (err)
2384                 goto out_driver;
2385         return 0;
2386
2387 out_driver:
2388         driver_unregister(&af_iucv_driver);
2389 out_iucv:
2390         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2391 out:
2392         return err;
2393 }
2394
2395 static int __init afiucv_init(void)
2396 {
2397         int err;
2398
2399         if (MACHINE_IS_VM) {
2400                 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2401                 if (unlikely(err)) {
2402                         WARN_ON(err);
2403                         err = -EPROTONOSUPPORT;
2404                         goto out;
2405                 }
2406
2407                 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2408                 if (!pr_iucv) {
2409                         printk(KERN_WARNING "iucv_if lookup failed\n");
2410                         memset(&iucv_userid, 0, sizeof(iucv_userid));
2411                 }
2412         } else {
2413                 memset(&iucv_userid, 0, sizeof(iucv_userid));
2414                 pr_iucv = NULL;
2415         }
2416
2417         err = proto_register(&iucv_proto, 0);
2418         if (err)
2419                 goto out;
2420         err = sock_register(&iucv_sock_family_ops);
2421         if (err)
2422                 goto out_proto;
2423
2424         if (pr_iucv) {
2425                 err = afiucv_iucv_init();
2426                 if (err)
2427                         goto out_sock;
2428         } else
2429                 register_netdevice_notifier(&afiucv_netdev_notifier);
2430         dev_add_pack(&iucv_packet_type);
2431         return 0;
2432
2433 out_sock:
2434         sock_unregister(PF_IUCV);
2435 out_proto:
2436         proto_unregister(&iucv_proto);
2437 out:
2438         if (pr_iucv)
2439                 symbol_put(iucv_if);
2440         return err;
2441 }
2442
2443 static void __exit afiucv_exit(void)
2444 {
2445         if (pr_iucv) {
2446                 device_unregister(af_iucv_dev);
2447                 driver_unregister(&af_iucv_driver);
2448                 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2449                 symbol_put(iucv_if);
2450         } else
2451                 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2452         dev_remove_pack(&iucv_packet_type);
2453         sock_unregister(PF_IUCV);
2454         proto_unregister(&iucv_proto);
2455 }
2456
2457 module_init(afiucv_init);
2458 module_exit(afiucv_exit);
2459
2460 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2461 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2462 MODULE_VERSION(VERSION);
2463 MODULE_LICENSE("GPL");
2464 MODULE_ALIAS_NETPROTO(PF_IUCV);
2465