net/iucv/af_iucv.c

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