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