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