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