net/iucv/af_iucv.c

   1 /*
   2  *  IUCV protocol stack for Linux on zSeries
   3  *
   4  *  Copyright IBM Corp. 2006, 2009
   5  *
   6  *  Author(s):  Jennifer Hunt <jenhunt@us.ibm.com>
   7  *              Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
   8  *  PM functions:
   9  *              Ursula Braun <ursula.braun@de.ibm.com>
  10  */
  11
  12 #define KMSG_COMPONENT "af_iucv"
  13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/list.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/slab.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/init.h>
  24 #include <linux/poll.h>
  25 #include <net/sock.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/cpcmd.h>
  28 #include <linux/kmod.h>
  29
  30 #include <net/iucv/af_iucv.h>
  31
  32 #define VERSION "1.2"
  33
  34 static char iucv_userid[80];
  35
  36 static const struct proto_ops iucv_sock_ops;
  37
  38 static struct proto iucv_proto = {
  39         .name           = "AF_IUCV",
  40         .owner          = THIS_MODULE,
  41         .obj_size       = sizeof(struct iucv_sock),
  42 };
  43
  44 static struct iucv_interface *pr_iucv;
  45
  46 /* special AF_IUCV IPRM messages */
  47 static const u8 iprm_shutdown[8] =
  48         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
  49
  50 #define TRGCLS_SIZE     (sizeof(((struct iucv_message *)0)->class))
  51
  52 #define __iucv_sock_wait(sk, condition, timeo, ret)                     \
  53 do {                                                                    \
  54         DEFINE_WAIT(__wait);                                            \
  55         long __timeo = timeo;                                           \
  56         ret = 0;                                                        \
  57         prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE);     \
  58         while (!(condition)) {                                          \
  59                 if (!__timeo) {                                         \
  60                         ret = -EAGAIN;                                  \
  61                         break;                                          \
  62                 }                                                       \
  63                 if (signal_pending(current)) {                          \
  64                         ret = sock_intr_errno(__timeo);                 \
  65                         break;                                          \
  66                 }                                                       \
  67                 release_sock(sk);                                       \
  68                 __timeo = schedule_timeout(__timeo);                    \
  69                 lock_sock(sk);                                          \
  70                 ret = sock_error(sk);                                   \
  71                 if (ret)                                                \
  72                         break;                                          \
  73         }                                                               \
  74         finish_wait(sk_sleep(sk), &__wait);                             \
  75 } while (0)
  76
  77 #define iucv_sock_wait(sk, condition, timeo)                            \
  78 ({                                                                      \
  79         int __ret = 0;                                                  \
  80         if (!(condition))                                               \
  81                 __iucv_sock_wait(sk, condition, timeo, __ret);          \
  82         __ret;                                                          \
  83 })
  84
  85 static void iucv_sock_kill(struct sock *sk);
  86 static void iucv_sock_close(struct sock *sk);
  87 static void iucv_sever_path(struct sock *, int);
  88
  89 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
  90         struct packet_type *pt, struct net_device *orig_dev);
  91 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
  92                    struct sk_buff *skb, u8 flags);
  93 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
  94
  95 /* Call Back functions */
  96 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  97 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
  98 static void iucv_callback_connack(struct iucv_path *, u8 *);
  99 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
 100 static void iucv_callback_connrej(struct iucv_path *, u8 *);
 101 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
 102
 103 static struct iucv_sock_list iucv_sk_list = {
 104         .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
 105         .autobind_name = ATOMIC_INIT(0)
 106 };
 107
 108 static struct iucv_handler af_iucv_handler = {
 109         .path_pending     = iucv_callback_connreq,
 110         .path_complete    = iucv_callback_connack,
 111         .path_severed     = iucv_callback_connrej,
 112         .message_pending  = iucv_callback_rx,
 113         .message_complete = iucv_callback_txdone,
 114         .path_quiesced    = iucv_callback_shutdown,
 115 };
 116
 117 static inline void high_nmcpy(unsigned char *dst, char *src)
 118 {
 119        memcpy(dst, src, 8);
 120 }
 121
 122 static inline void low_nmcpy(unsigned char *dst, char *src)
 123 {
 124        memcpy(&dst[8], src, 8);
 125 }
 126
 127 static int afiucv_pm_prepare(struct device *dev)
 128 {
 129 #ifdef CONFIG_PM_DEBUG
 130         printk(KERN_WARNING "afiucv_pm_prepare\n");
 131 #endif
 132         return 0;
 133 }
 134
 135 static void afiucv_pm_complete(struct device *dev)
 136 {
 137 #ifdef CONFIG_PM_DEBUG
 138         printk(KERN_WARNING "afiucv_pm_complete\n");
 139 #endif
 140 }
 141
 142 /**
 143  * afiucv_pm_freeze() - Freeze PM callback
 144  * @dev:        AFIUCV dummy device
 145  *
 146  * Sever all established IUCV communication pathes
 147  */
 148 static int afiucv_pm_freeze(struct device *dev)
 149 {
 150         struct iucv_sock *iucv;
 151         struct sock *sk;
 152         int err = 0;
 153
 154 #ifdef CONFIG_PM_DEBUG
 155         printk(KERN_WARNING "afiucv_pm_freeze\n");
 156 #endif
 157         read_lock(&iucv_sk_list.lock);
 158         sk_for_each(sk, &iucv_sk_list.head) {
 159                 iucv = iucv_sk(sk);
 160                 switch (sk->sk_state) {
 161                 case IUCV_DISCONN:
 162                 case IUCV_CLOSING:
 163                 case IUCV_CONNECTED:
 164                         iucv_sever_path(sk, 0);
 165                         break;
 166                 case IUCV_OPEN:
 167                 case IUCV_BOUND:
 168                 case IUCV_LISTEN:
 169                 case IUCV_CLOSED:
 170                 default:
 171                         break;
 172                 }
 173                 skb_queue_purge(&iucv->send_skb_q);
 174                 skb_queue_purge(&iucv->backlog_skb_q);
 175         }
 176         read_unlock(&iucv_sk_list.lock);
 177         return err;
 178 }
 179
 180 /**
 181  * afiucv_pm_restore_thaw() - Thaw and restore PM callback
 182  * @dev:        AFIUCV dummy device
 183  *
 184  * socket clean up after freeze
 185  */
 186 static int afiucv_pm_restore_thaw(struct device *dev)
 187 {
 188         struct sock *sk;
 189
 190 #ifdef CONFIG_PM_DEBUG
 191         printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
 192 #endif
 193         read_lock(&iucv_sk_list.lock);
 194         sk_for_each(sk, &iucv_sk_list.head) {
 195                 switch (sk->sk_state) {
 196                 case IUCV_CONNECTED:
 197                         sk->sk_err = EPIPE;
 198                         sk->sk_state = IUCV_DISCONN;
 199                         sk->sk_state_change(sk);
 200                         break;
 201                 case IUCV_DISCONN:
 202                 case IUCV_CLOSING:
 203                 case IUCV_LISTEN:
 204                 case IUCV_BOUND:
 205                 case IUCV_OPEN:
 206                 default:
 207                         break;
 208                 }
 209         }
 210         read_unlock(&iucv_sk_list.lock);
 211         return 0;
 212 }
 213
 214 static const struct dev_pm_ops afiucv_pm_ops = {
 215         .prepare = afiucv_pm_prepare,
 216         .complete = afiucv_pm_complete,
 217         .freeze = afiucv_pm_freeze,
 218         .thaw = afiucv_pm_restore_thaw,
 219         .restore = afiucv_pm_restore_thaw,
 220 };
 221
 222 static struct device_driver af_iucv_driver = {
 223         .owner = THIS_MODULE,
 224         .name = "afiucv",
 225         .bus  = NULL,
 226         .pm   = &afiucv_pm_ops,
 227 };
 228
 229 /* dummy device used as trigger for PM functions */
 230 static struct device *af_iucv_dev;
 231
 232 /**
 233  * iucv_msg_length() - Returns the length of an iucv message.
 234  * @msg:        Pointer to struct iucv_message, MUST NOT be NULL
 235  *
 236  * The function returns the length of the specified iucv message @msg of data
 237  * stored in a buffer and of data stored in the parameter list (PRMDATA).
 238  *
 239  * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
 240  * data:
 241  *      PRMDATA[0..6]   socket data (max 7 bytes);
 242  *      PRMDATA[7]      socket data length value (len is 0xff - PRMDATA[7])
 243  *
 244  * The socket data length is computed by subtracting the socket data length
 245  * value from 0xFF.
 246  * If the socket data len is greater 7, then PRMDATA can be used for special
 247  * notifications (see iucv_sock_shutdown); and further,
 248  * if the socket data len is > 7, the function returns 8.
 249  *
 250  * Use this function to allocate socket buffers to store iucv message data.
 251  */
 252 static inline size_t iucv_msg_length(struct iucv_message *msg)
 253 {
 254         size_t datalen;
 255
 256         if (msg->flags & IUCV_IPRMDATA) {
 257                 datalen = 0xff - msg->rmmsg[7];
 258                 return (datalen < 8) ? datalen : 8;
 259         }
 260         return msg->length;
 261 }
 262
 263 /**
 264  * iucv_sock_in_state() - check for specific states
 265  * @sk:         sock structure
 266  * @state:      first iucv sk state
 267  * @state:      second iucv sk state
 268  *
 269  * Returns true if the socket in either in the first or second state.
 270  */
 271 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
 272 {
 273         return (sk->sk_state == state || sk->sk_state == state2);
 274 }
 275
 276 /**
 277  * iucv_below_msglim() - function to check if messages can be sent
 278  * @sk:         sock structure
 279  *
 280  * Returns true if the send queue length is lower than the message limit.
 281  * Always returns true if the socket is not connected (no iucv path for
 282  * checking the message limit).
 283  */
 284 static inline int iucv_below_msglim(struct sock *sk)
 285 {
 286         struct iucv_sock *iucv = iucv_sk(sk);
 287
 288         if (sk->sk_state != IUCV_CONNECTED)
 289                 return 1;
 290         if (iucv->transport == AF_IUCV_TRANS_IUCV)
 291                 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
 292         else
 293                 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
 294                         (atomic_read(&iucv->pendings) <= 0));
 295 }
 296
 297 /**
 298  * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
 299  */
 300 static void iucv_sock_wake_msglim(struct sock *sk)
 301 {
 302         struct socket_wq *wq;
 303
 304         rcu_read_lock();
 305         wq = rcu_dereference(sk->sk_wq);
 306         if (skwq_has_sleeper(wq))
 307                 wake_up_interruptible_all(&wq->wait);
 308         sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 309         rcu_read_unlock();
 310 }
 311
 312 /**
 313  * afiucv_hs_send() - send a message through HiperSockets transport
 314  */
 315 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
 316                    struct sk_buff *skb, u8 flags)
 317 {
 318         struct iucv_sock *iucv = iucv_sk(sock);
 319         struct af_iucv_trans_hdr *phs_hdr;
 320         struct sk_buff *nskb;
 321         int err, confirm_recv = 0;
 322
 323         memset(skb->head, 0, ETH_HLEN);
 324         phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
 325                                         sizeof(struct af_iucv_trans_hdr));
 326         skb_reset_mac_header(skb);
 327         skb_reset_network_header(skb);
 328         skb_push(skb, ETH_HLEN);
 329         skb_reset_mac_header(skb);
 330         memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
 331
 332         phs_hdr->magic = ETH_P_AF_IUCV;
 333         phs_hdr->version = 1;
 334         phs_hdr->flags = flags;
 335         if (flags == AF_IUCV_FLAG_SYN)
 336                 phs_hdr->window = iucv->msglimit;
 337         else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
 338                 confirm_recv = atomic_read(&iucv->msg_recv);
 339                 phs_hdr->window = confirm_recv;
 340                 if (confirm_recv)
 341                         phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
 342         }
 343         memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
 344         memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
 345         memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
 346         memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
 347         ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
 348         ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
 349         ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
 350         ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
 351         if (imsg)
 352                 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
 353
 354         skb->dev = iucv->hs_dev;
 355         if (!skb->dev)
 356                 return -ENODEV;
 357         if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
 358                 return -ENETDOWN;
 359         if (skb->len > skb->dev->mtu) {
 360                 if (sock->sk_type == SOCK_SEQPACKET)
 361                         return -EMSGSIZE;
 362                 else
 363                         skb_trim(skb, skb->dev->mtu);
 364         }
 365         skb->protocol = ETH_P_AF_IUCV;
 366         nskb = skb_clone(skb, GFP_ATOMIC);
 367         if (!nskb)
 368                 return -ENOMEM;
 369         skb_queue_tail(&iucv->send_skb_q, nskb);
 370         err = dev_queue_xmit(skb);
 371         if (net_xmit_eval(err)) {
 372                 skb_unlink(nskb, &iucv->send_skb_q);
 373                 kfree_skb(nskb);
 374         } else {
 375                 atomic_sub(confirm_recv, &iucv->msg_recv);
 376                 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
 377         }
 378         return net_xmit_eval(err);
 379 }
 380
 381 static struct sock *__iucv_get_sock_by_name(char *nm)
 382 {
 383         struct sock *sk;
 384
 385         sk_for_each(sk, &iucv_sk_list.head)
 386                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 387                         return sk;
 388
 389         return NULL;
 390 }
 391
 392 static void iucv_sock_destruct(struct sock *sk)
 393 {
 394         skb_queue_purge(&sk->sk_receive_queue);
 395         skb_queue_purge(&sk->sk_error_queue);
 396
 397         sk_mem_reclaim(sk);
 398
 399         if (!sock_flag(sk, SOCK_DEAD)) {
 400                 pr_err("Attempt to release alive iucv socket %p\n", sk);
 401                 return;
 402         }
 403
 404         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 405         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 406         WARN_ON(sk->sk_wmem_queued);
 407         WARN_ON(sk->sk_forward_alloc);
 408 }
 409
 410 /* Cleanup Listen */
 411 static void iucv_sock_cleanup_listen(struct sock *parent)
 412 {
 413         struct sock *sk;
 414
 415         /* Close non-accepted connections */
 416         while ((sk = iucv_accept_dequeue(parent, NULL))) {
 417                 iucv_sock_close(sk);
 418                 iucv_sock_kill(sk);
 419         }
 420
 421         parent->sk_state = IUCV_CLOSED;
 422 }
 423
 424 /* Kill socket (only if zapped and orphaned) */
 425 static void iucv_sock_kill(struct sock *sk)
 426 {
 427         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 428                 return;
 429
 430         iucv_sock_unlink(&iucv_sk_list, sk);
 431         sock_set_flag(sk, SOCK_DEAD);
 432         sock_put(sk);
 433 }
 434
 435 /* Terminate an IUCV path */
 436 static void iucv_sever_path(struct sock *sk, int with_user_data)
 437 {
 438         unsigned char user_data[16];
 439         struct iucv_sock *iucv = iucv_sk(sk);
 440         struct iucv_path *path = iucv->path;
 441
 442         if (iucv->path) {
 443                 iucv->path = NULL;
 444                 if (with_user_data) {
 445                         low_nmcpy(user_data, iucv->src_name);
 446                         high_nmcpy(user_data, iucv->dst_name);
 447                         ASCEBC(user_data, sizeof(user_data));
 448                         pr_iucv->path_sever(path, user_data);
 449                 } else
 450                         pr_iucv->path_sever(path, NULL);
 451                 iucv_path_free(path);
 452         }
 453 }
 454
 455 /* Send FIN through an IUCV socket for HIPER transport */
 456 static int iucv_send_ctrl(struct sock *sk, u8 flags)
 457 {
 458         int err = 0;
 459         int blen;
 460         struct sk_buff *skb;
 461
 462         blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
 463         skb = sock_alloc_send_skb(sk, blen, 1, &err);
 464         if (skb) {
 465                 skb_reserve(skb, blen);
 466                 err = afiucv_hs_send(NULL, sk, skb, flags);
 467         }
 468         return err;
 469 }
 470
 471 /* Close an IUCV socket */
 472 static void iucv_sock_close(struct sock *sk)
 473 {
 474         struct iucv_sock *iucv = iucv_sk(sk);
 475         unsigned long timeo;
 476         int err = 0;
 477
 478         lock_sock(sk);
 479
 480         switch (sk->sk_state) {
 481         case IUCV_LISTEN:
 482                 iucv_sock_cleanup_listen(sk);
 483                 break;
 484
 485         case IUCV_CONNECTED:
 486                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
 487                         err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
 488                         sk->sk_state = IUCV_DISCONN;
 489                         sk->sk_state_change(sk);
 490                 }
 491         case IUCV_DISCONN:   /* fall through */
 492                 sk->sk_state = IUCV_CLOSING;
 493                 sk->sk_state_change(sk);
 494
 495                 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
 496                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 497                                 timeo = sk->sk_lingertime;
 498                         else
 499                                 timeo = IUCV_DISCONN_TIMEOUT;
 500                         iucv_sock_wait(sk,
 501                                         iucv_sock_in_state(sk, IUCV_CLOSED, 0),
 502                                         timeo);
 503                 }
 504
 505         case IUCV_CLOSING:   /* fall through */
 506                 sk->sk_state = IUCV_CLOSED;
 507                 sk->sk_state_change(sk);
 508
 509                 sk->sk_err = ECONNRESET;
 510                 sk->sk_state_change(sk);
 511
 512                 skb_queue_purge(&iucv->send_skb_q);
 513                 skb_queue_purge(&iucv->backlog_skb_q);
 514
 515         default:   /* fall through */
 516                 iucv_sever_path(sk, 1);
 517         }
 518
 519         if (iucv->hs_dev) {
 520                 dev_put(iucv->hs_dev);
 521                 iucv->hs_dev = NULL;
 522                 sk->sk_bound_dev_if = 0;
 523         }
 524
 525         /* mark socket for deletion by iucv_sock_kill() */
 526         sock_set_flag(sk, SOCK_ZAPPED);
 527
 528         release_sock(sk);
 529 }
 530
 531 static void iucv_sock_init(struct sock *sk, struct sock *parent)
 532 {
 533         if (parent)
 534                 sk->sk_type = parent->sk_type;
 535 }
 536
 537 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
 538 {
 539         struct sock *sk;
 540         struct iucv_sock *iucv;
 541
 542         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
 543         if (!sk)
 544                 return NULL;
 545         iucv = iucv_sk(sk);
 546
 547         sock_init_data(sock, sk);
 548         INIT_LIST_HEAD(&iucv->accept_q);
 549         spin_lock_init(&iucv->accept_q_lock);
 550         skb_queue_head_init(&iucv->send_skb_q);
 551         INIT_LIST_HEAD(&iucv->message_q.list);
 552         spin_lock_init(&iucv->message_q.lock);
 553         skb_queue_head_init(&iucv->backlog_skb_q);
 554         iucv->send_tag = 0;
 555         atomic_set(&iucv->pendings, 0);
 556         iucv->flags = 0;
 557         iucv->msglimit = 0;
 558         atomic_set(&iucv->msg_sent, 0);
 559         atomic_set(&iucv->msg_recv, 0);
 560         iucv->path = NULL;
 561         iucv->sk_txnotify = afiucv_hs_callback_txnotify;
 562         memset(&iucv->src_user_id , 0, 32);
 563         if (pr_iucv)
 564                 iucv->transport = AF_IUCV_TRANS_IUCV;
 565         else
 566                 iucv->transport = AF_IUCV_TRANS_HIPER;
 567
 568         sk->sk_destruct = iucv_sock_destruct;
 569         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 570         sk->sk_allocation = GFP_DMA;
 571
 572         sock_reset_flag(sk, SOCK_ZAPPED);
 573
 574         sk->sk_protocol = proto;
 575         sk->sk_state    = IUCV_OPEN;
 576
 577         iucv_sock_link(&iucv_sk_list, sk);
 578         return sk;
 579 }
 580
 581 /* Create an IUCV socket */
 582 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
 583                             int kern)
 584 {
 585         struct sock *sk;
 586
 587         if (protocol && protocol != PF_IUCV)
 588                 return -EPROTONOSUPPORT;
 589
 590         sock->state = SS_UNCONNECTED;
 591
 592         switch (sock->type) {
 593         case SOCK_STREAM:
 594                 sock->ops = &iucv_sock_ops;
 595                 break;
 596         case SOCK_SEQPACKET:
 597                 /* currently, proto ops can handle both sk types */
 598                 sock->ops = &iucv_sock_ops;
 599                 break;
 600         default:
 601                 return -ESOCKTNOSUPPORT;
 602         }
 603
 604         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
 605         if (!sk)
 606                 return -ENOMEM;
 607
 608         iucv_sock_init(sk, NULL);
 609
 610         return 0;
 611 }
 612
 613 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 614 {
 615         write_lock_bh(&l->lock);
 616         sk_add_node(sk, &l->head);
 617         write_unlock_bh(&l->lock);
 618 }
 619
 620 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 621 {
 622         write_lock_bh(&l->lock);
 623         sk_del_node_init(sk);
 624         write_unlock_bh(&l->lock);
 625 }
 626
 627 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 628 {
 629         unsigned long flags;
 630         struct iucv_sock *par = iucv_sk(parent);
 631
 632         sock_hold(sk);
 633         spin_lock_irqsave(&par->accept_q_lock, flags);
 634         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 635         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 636         iucv_sk(sk)->parent = parent;
 637         sk_acceptq_added(parent);
 638 }
 639
 640 void iucv_accept_unlink(struct sock *sk)
 641 {
 642         unsigned long flags;
 643         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 644
 645         spin_lock_irqsave(&par->accept_q_lock, flags);
 646         list_del_init(&iucv_sk(sk)->accept_q);
 647         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 648         sk_acceptq_removed(iucv_sk(sk)->parent);
 649         iucv_sk(sk)->parent = NULL;
 650         sock_put(sk);
 651 }
 652
 653 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 654 {
 655         struct iucv_sock *isk, *n;
 656         struct sock *sk;
 657
 658         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 659                 sk = (struct sock *) isk;
 660                 lock_sock(sk);
 661
 662                 if (sk->sk_state == IUCV_CLOSED) {
 663                         iucv_accept_unlink(sk);
 664                         release_sock(sk);
 665                         continue;
 666                 }
 667
 668                 if (sk->sk_state == IUCV_CONNECTED ||
 669                     sk->sk_state == IUCV_DISCONN ||
 670                     !newsock) {
 671                         iucv_accept_unlink(sk);
 672                         if (newsock)
 673                                 sock_graft(sk, newsock);
 674
 675                         release_sock(sk);
 676                         return sk;
 677                 }
 678
 679                 release_sock(sk);
 680         }
 681         return NULL;
 682 }
 683
 684 static void __iucv_auto_name(struct iucv_sock *iucv)
 685 {
 686         char name[12];
 687
 688         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 689         while (__iucv_get_sock_by_name(name)) {
 690                 sprintf(name, "%08x",
 691                         atomic_inc_return(&iucv_sk_list.autobind_name));
 692         }
 693         memcpy(iucv->src_name, name, 8);
 694 }
 695
 696 /* Bind an unbound socket */
 697 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 698                           int addr_len)
 699 {
 700         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 701         struct sock *sk = sock->sk;
 702         struct iucv_sock *iucv;
 703         int err = 0;
 704         struct net_device *dev;
 705         char uid[9];
 706
 707         /* Verify the input sockaddr */
 708         if (!addr || addr->sa_family != AF_IUCV)
 709                 return -EINVAL;
 710
 711         lock_sock(sk);
 712         if (sk->sk_state != IUCV_OPEN) {
 713                 err = -EBADFD;
 714                 goto done;
 715         }
 716
 717         write_lock_bh(&iucv_sk_list.lock);
 718
 719         iucv = iucv_sk(sk);
 720         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 721                 err = -EADDRINUSE;
 722                 goto done_unlock;
 723         }
 724         if (iucv->path)
 725                 goto done_unlock;
 726
 727         /* Bind the socket */
 728         if (pr_iucv)
 729                 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
 730                         goto vm_bind; /* VM IUCV transport */
 731
 732         /* try hiper transport */
 733         memcpy(uid, sa->siucv_user_id, sizeof(uid));
 734         ASCEBC(uid, 8);
 735         rcu_read_lock();
 736         for_each_netdev_rcu(&init_net, dev) {
 737                 if (!memcmp(dev->perm_addr, uid, 8)) {
 738                         memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
 739                         /* Check for unitialized siucv_name */
 740                         if (strncmp(sa->siucv_name, "        ", 8) == 0)
 741                                 __iucv_auto_name(iucv);
 742                         else
 743                                 memcpy(iucv->src_name, sa->siucv_name, 8);
 744                         sk->sk_bound_dev_if = dev->ifindex;
 745                         iucv->hs_dev = dev;
 746                         dev_hold(dev);
 747                         sk->sk_state = IUCV_BOUND;
 748                         iucv->transport = AF_IUCV_TRANS_HIPER;
 749                         if (!iucv->msglimit)
 750                                 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
 751                         rcu_read_unlock();
 752                         goto done_unlock;
 753                 }
 754         }
 755         rcu_read_unlock();
 756 vm_bind:
 757         if (pr_iucv) {
 758                 /* use local userid for backward compat */
 759                 memcpy(iucv->src_name, sa->siucv_name, 8);
 760                 memcpy(iucv->src_user_id, iucv_userid, 8);
 761                 sk->sk_state = IUCV_BOUND;
 762                 iucv->transport = AF_IUCV_TRANS_IUCV;
 763                 if (!iucv->msglimit)
 764                         iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 765                 goto done_unlock;
 766         }
 767         /* found no dev to bind */
 768         err = -ENODEV;
 769 done_unlock:
 770         /* Release the socket list lock */
 771         write_unlock_bh(&iucv_sk_list.lock);
 772 done:
 773         release_sock(sk);
 774         return err;
 775 }
 776
 777 /* Automatically bind an unbound socket */
 778 static int iucv_sock_autobind(struct sock *sk)
 779 {
 780         struct iucv_sock *iucv = iucv_sk(sk);
 781         int err = 0;
 782
 783         if (unlikely(!pr_iucv))
 784                 return -EPROTO;
 785
 786         memcpy(iucv->src_user_id, iucv_userid, 8);
 787
 788         write_lock_bh(&iucv_sk_list.lock);
 789         __iucv_auto_name(iucv);
 790         write_unlock_bh(&iucv_sk_list.lock);
 791
 792         if (!iucv->msglimit)
 793                 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 794
 795         return err;
 796 }
 797
 798 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
 799 {
 800         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 801         struct sock *sk = sock->sk;
 802         struct iucv_sock *iucv = iucv_sk(sk);
 803         unsigned char user_data[16];
 804         int err;
 805
 806         high_nmcpy(user_data, sa->siucv_name);
 807         low_nmcpy(user_data, iucv->src_name);
 808         ASCEBC(user_data, sizeof(user_data));
 809
 810         /* Create path. */
 811         iucv->path = iucv_path_alloc(iucv->msglimit,
 812                                      IUCV_IPRMDATA, GFP_KERNEL);
 813         if (!iucv->path) {
 814                 err = -ENOMEM;
 815                 goto done;
 816         }
 817         err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
 818                                     sa->siucv_user_id, NULL, user_data,
 819                                     sk);
 820         if (err) {
 821                 iucv_path_free(iucv->path);
 822                 iucv->path = NULL;
 823                 switch (err) {
 824                 case 0x0b:      /* Target communicator is not logged on */
 825                         err = -ENETUNREACH;
 826                         break;
 827                 case 0x0d:      /* Max connections for this guest exceeded */
 828                 case 0x0e:      /* Max connections for target guest exceeded */
 829                         err = -EAGAIN;
 830                         break;
 831                 case 0x0f:      /* Missing IUCV authorization */
 832                         err = -EACCES;
 833                         break;
 834                 default:
 835                         err = -ECONNREFUSED;
 836                         break;
 837                 }
 838         }
 839 done:
 840         return err;
 841 }
 842
 843 /* Connect an unconnected socket */
 844 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 845                              int alen, int flags)
 846 {
 847         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 848         struct sock *sk = sock->sk;
 849         struct iucv_sock *iucv = iucv_sk(sk);
 850         int err;
 851
 852         if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
 853                 return -EINVAL;
 854
 855         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 856                 return -EBADFD;
 857
 858         if (sk->sk_state == IUCV_OPEN &&
 859             iucv->transport == AF_IUCV_TRANS_HIPER)
 860                 return -EBADFD; /* explicit bind required */
 861
 862         if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
 863                 return -EINVAL;
 864
 865         if (sk->sk_state == IUCV_OPEN) {
 866                 err = iucv_sock_autobind(sk);
 867                 if (unlikely(err))
 868                         return err;
 869         }
 870
 871         lock_sock(sk);
 872
 873         /* Set the destination information */
 874         memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
 875         memcpy(iucv->dst_name, sa->siucv_name, 8);
 876
 877         if (iucv->transport == AF_IUCV_TRANS_HIPER)
 878                 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
 879         else
 880                 err = afiucv_path_connect(sock, addr);
 881         if (err)
 882                 goto done;
 883
 884         if (sk->sk_state != IUCV_CONNECTED)
 885                 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
 886                                                             IUCV_DISCONN),
 887                                      sock_sndtimeo(sk, flags & O_NONBLOCK));
 888
 889         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
 890                 err = -ECONNREFUSED;
 891
 892         if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
 893                 iucv_sever_path(sk, 0);
 894
 895 done:
 896         release_sock(sk);
 897         return err;
 898 }
 899
 900 /* Move a socket into listening state. */
 901 static int iucv_sock_listen(struct socket *sock, int backlog)
 902 {
 903         struct sock *sk = sock->sk;
 904         int err;
 905
 906         lock_sock(sk);
 907
 908         err = -EINVAL;
 909         if (sk->sk_state != IUCV_BOUND)
 910                 goto done;
 911
 912         if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
 913                 goto done;
 914
 915         sk->sk_max_ack_backlog = backlog;
 916         sk->sk_ack_backlog = 0;
 917         sk->sk_state = IUCV_LISTEN;
 918         err = 0;
 919
 920 done:
 921         release_sock(sk);
 922         return err;
 923 }
 924
 925 /* Accept a pending connection */
 926 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 927                             int flags)
 928 {
 929         DECLARE_WAITQUEUE(wait, current);
 930         struct sock *sk = sock->sk, *nsk;
 931         long timeo;
 932         int err = 0;
 933
 934         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 935
 936         if (sk->sk_state != IUCV_LISTEN) {
 937                 err = -EBADFD;
 938                 goto done;
 939         }
 940
 941         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 942
 943         /* Wait for an incoming connection */
 944         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 945         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 946                 set_current_state(TASK_INTERRUPTIBLE);
 947                 if (!timeo) {
 948                         err = -EAGAIN;
 949                         break;
 950                 }
 951
 952                 release_sock(sk);
 953                 timeo = schedule_timeout(timeo);
 954                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 955
 956                 if (sk->sk_state != IUCV_LISTEN) {
 957                         err = -EBADFD;
 958                         break;
 959                 }
 960
 961                 if (signal_pending(current)) {
 962                         err = sock_intr_errno(timeo);
 963                         break;
 964                 }
 965         }
 966
 967         set_current_state(TASK_RUNNING);
 968         remove_wait_queue(sk_sleep(sk), &wait);
 969
 970         if (err)
 971                 goto done;
 972
 973         newsock->state = SS_CONNECTED;
 974
 975 done:
 976         release_sock(sk);
 977         return err;
 978 }
 979
 980 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 981                              int *len, int peer)
 982 {
 983         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 984         struct sock *sk = sock->sk;
 985         struct iucv_sock *iucv = iucv_sk(sk);
 986
 987         addr->sa_family = AF_IUCV;
 988         *len = sizeof(struct sockaddr_iucv);
 989
 990         if (peer) {
 991                 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
 992                 memcpy(siucv->siucv_name, iucv->dst_name, 8);
 993         } else {
 994                 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
 995                 memcpy(siucv->siucv_name, iucv->src_name, 8);
 996         }
 997         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
 998         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
 999         memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1000
1001         return 0;
1002 }
1003
1004 /**
1005  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1006  * @path:       IUCV path
1007  * @msg:        Pointer to a struct iucv_message
1008  * @skb:        The socket data to send, skb->len MUST BE <= 7
1009  *
1010  * Send the socket data in the parameter list in the iucv message
1011  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1012  * list and the socket data len at index 7 (last byte).
1013  * See also iucv_msg_length().
1014  *
1015  * Returns the error code from the iucv_message_send() call.
1016  */
1017 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1018                           struct sk_buff *skb)
1019 {
1020         u8 prmdata[8];
1021
1022         memcpy(prmdata, (void *) skb->data, skb->len);
1023         prmdata[7] = 0xff - (u8) skb->len;
1024         return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1025                                  (void *) prmdata, 8);
1026 }
1027
1028 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1029                              size_t len)
1030 {
1031         struct sock *sk = sock->sk;
1032         struct iucv_sock *iucv = iucv_sk(sk);
1033         struct sk_buff *skb;
1034         struct iucv_message txmsg = {0};
1035         struct cmsghdr *cmsg;
1036         int cmsg_done;
1037         long timeo;
1038         char user_id[9];
1039         char appl_id[9];
1040         int err;
1041         int noblock = msg->msg_flags & MSG_DONTWAIT;
1042
1043         err = sock_error(sk);
1044         if (err)
1045                 return err;
1046
1047         if (msg->msg_flags & MSG_OOB)
1048                 return -EOPNOTSUPP;
1049
1050         /* SOCK_SEQPACKET: we do not support segmented records */
1051         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1052                 return -EOPNOTSUPP;
1053
1054         lock_sock(sk);
1055
1056         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1057                 err = -EPIPE;
1058                 goto out;
1059         }
1060
1061         /* Return if the socket is not in connected state */
1062         if (sk->sk_state != IUCV_CONNECTED) {
1063                 err = -ENOTCONN;
1064                 goto out;
1065         }
1066
1067         /* initialize defaults */
1068         cmsg_done   = 0;        /* check for duplicate headers */
1069         txmsg.class = 0;
1070
1071         /* iterate over control messages */
1072         for_each_cmsghdr(cmsg, msg) {
1073                 if (!CMSG_OK(msg, cmsg)) {
1074                         err = -EINVAL;
1075                         goto out;
1076                 }
1077
1078                 if (cmsg->cmsg_level != SOL_IUCV)
1079                         continue;
1080
1081                 if (cmsg->cmsg_type & cmsg_done) {
1082                         err = -EINVAL;
1083                         goto out;
1084                 }
1085                 cmsg_done |= cmsg->cmsg_type;
1086
1087                 switch (cmsg->cmsg_type) {
1088                 case SCM_IUCV_TRGCLS:
1089                         if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1090                                 err = -EINVAL;
1091                                 goto out;
1092                         }
1093
1094                         /* set iucv message target class */
1095                         memcpy(&txmsg.class,
1096                                 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1097
1098                         break;
1099
1100                 default:
1101                         err = -EINVAL;
1102                         goto out;
1103                 }
1104         }
1105
1106         /* allocate one skb for each iucv message:
1107          * this is fine for SOCK_SEQPACKET (unless we want to support
1108          * segmented records using the MSG_EOR flag), but
1109          * for SOCK_STREAM we might want to improve it in future */
1110         if (iucv->transport == AF_IUCV_TRANS_HIPER)
1111                 skb = sock_alloc_send_skb(sk,
1112                         len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1113                         noblock, &err);
1114         else
1115                 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1116         if (!skb)
1117                 goto out;
1118         if (iucv->transport == AF_IUCV_TRANS_HIPER)
1119                 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1120         if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1121                 err = -EFAULT;
1122                 goto fail;
1123         }
1124
1125         /* wait if outstanding messages for iucv path has reached */
1126         timeo = sock_sndtimeo(sk, noblock);
1127         err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1128         if (err)
1129                 goto fail;
1130
1131         /* return -ECONNRESET if the socket is no longer connected */
1132         if (sk->sk_state != IUCV_CONNECTED) {
1133                 err = -ECONNRESET;
1134                 goto fail;
1135         }
1136
1137         /* increment and save iucv message tag for msg_completion cbk */
1138         txmsg.tag = iucv->send_tag++;
1139         IUCV_SKB_CB(skb)->tag = txmsg.tag;
1140
1141         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1142                 atomic_inc(&iucv->msg_sent);
1143                 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1144                 if (err) {
1145                         atomic_dec(&iucv->msg_sent);
1146                         goto fail;
1147                 }
1148                 goto release;
1149         }
1150         skb_queue_tail(&iucv->send_skb_q, skb);
1151
1152         if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1153               && skb->len <= 7) {
1154                 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1155
1156                 /* on success: there is no message_complete callback
1157                  * for an IPRMDATA msg; remove skb from send queue */
1158                 if (err == 0) {
1159                         skb_unlink(skb, &iucv->send_skb_q);
1160                         kfree_skb(skb);
1161                 }
1162
1163                 /* this error should never happen since the
1164                  * IUCV_IPRMDATA path flag is set... sever path */
1165                 if (err == 0x15) {
1166                         pr_iucv->path_sever(iucv->path, NULL);
1167                         skb_unlink(skb, &iucv->send_skb_q);
1168                         err = -EPIPE;
1169                         goto fail;
1170                 }
1171         } else
1172                 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1173                                         (void *) skb->data, skb->len);
1174         if (err) {
1175                 if (err == 3) {
1176                         user_id[8] = 0;
1177                         memcpy(user_id, iucv->dst_user_id, 8);
1178                         appl_id[8] = 0;
1179                         memcpy(appl_id, iucv->dst_name, 8);
1180                         pr_err("Application %s on z/VM guest %s"
1181                                 " exceeds message limit\n",
1182                                 appl_id, user_id);
1183                         err = -EAGAIN;
1184                 } else
1185                         err = -EPIPE;
1186                 skb_unlink(skb, &iucv->send_skb_q);
1187                 goto fail;
1188         }
1189
1190 release:
1191         release_sock(sk);
1192         return len;
1193
1194 fail:
1195         kfree_skb(skb);
1196 out:
1197         release_sock(sk);
1198         return err;
1199 }
1200
1201 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1202  *
1203  * Locking: must be called with message_q.lock held
1204  */
1205 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1206 {
1207         int dataleft, size, copied = 0;
1208         struct sk_buff *nskb;
1209
1210         dataleft = len;
1211         while (dataleft) {
1212                 if (dataleft >= sk->sk_rcvbuf / 4)
1213                         size = sk->sk_rcvbuf / 4;
1214                 else
1215                         size = dataleft;
1216
1217                 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1218                 if (!nskb)
1219                         return -ENOMEM;
1220
1221                 /* copy target class to control buffer of new skb */
1222                 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
1223
1224                 /* copy data fragment */
1225                 memcpy(nskb->data, skb->data + copied, size);
1226                 copied += size;
1227                 dataleft -= size;
1228
1229                 skb_reset_transport_header(nskb);
1230                 skb_reset_network_header(nskb);
1231                 nskb->len = size;
1232
1233                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1234         }
1235
1236         return 0;
1237 }
1238
1239 /* iucv_process_message() - Receive a single outstanding IUCV message
1240  *
1241  * Locking: must be called with message_q.lock held
1242  */
1243 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1244                                  struct iucv_path *path,
1245                                  struct iucv_message *msg)
1246 {
1247         int rc;
1248         unsigned int len;
1249
1250         len = iucv_msg_length(msg);
1251
1252         /* store msg target class in the second 4 bytes of skb ctrl buffer */
1253         /* Note: the first 4 bytes are reserved for msg tag */
1254         IUCV_SKB_CB(skb)->class = msg->class;
1255
1256         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1257         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1258                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1259                         skb->data = NULL;
1260                         skb->len = 0;
1261                 }
1262         } else {
1263                 rc = pr_iucv->message_receive(path, msg,
1264                                               msg->flags & IUCV_IPRMDATA,
1265                                               skb->data, len, NULL);
1266                 if (rc) {
1267                         kfree_skb(skb);
1268                         return;
1269                 }
1270                 /* we need to fragment iucv messages for SOCK_STREAM only;
1271                  * for SOCK_SEQPACKET, it is only relevant if we support
1272                  * record segmentation using MSG_EOR (see also recvmsg()) */
1273                 if (sk->sk_type == SOCK_STREAM &&
1274                     skb->truesize >= sk->sk_rcvbuf / 4) {
1275                         rc = iucv_fragment_skb(sk, skb, len);
1276                         kfree_skb(skb);
1277                         skb = NULL;
1278                         if (rc) {
1279                                 pr_iucv->path_sever(path, NULL);
1280                                 return;
1281                         }
1282                         skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1283                 } else {
1284                         skb_reset_transport_header(skb);
1285                         skb_reset_network_header(skb);
1286                         skb->len = len;
1287                 }
1288         }
1289
1290         IUCV_SKB_CB(skb)->offset = 0;
1291         if (sock_queue_rcv_skb(sk, skb))
1292                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1293 }
1294
1295 /* iucv_process_message_q() - Process outstanding IUCV messages
1296  *
1297  * Locking: must be called with message_q.lock held
1298  */
1299 static void iucv_process_message_q(struct sock *sk)
1300 {
1301         struct iucv_sock *iucv = iucv_sk(sk);
1302         struct sk_buff *skb;
1303         struct sock_msg_q *p, *n;
1304
1305         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1306                 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1307                 if (!skb)
1308                         break;
1309                 iucv_process_message(sk, skb, p->path, &p->msg);
1310                 list_del(&p->list);
1311                 kfree(p);
1312                 if (!skb_queue_empty(&iucv->backlog_skb_q))
1313                         break;
1314         }
1315 }
1316
1317 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1318                              size_t len, int flags)
1319 {
1320         int noblock = flags & MSG_DONTWAIT;
1321         struct sock *sk = sock->sk;
1322         struct iucv_sock *iucv = iucv_sk(sk);
1323         unsigned int copied, rlen;
1324         struct sk_buff *skb, *rskb, *cskb;
1325         int err = 0;
1326         u32 offset;
1327
1328         if ((sk->sk_state == IUCV_DISCONN) &&
1329             skb_queue_empty(&iucv->backlog_skb_q) &&
1330             skb_queue_empty(&sk->sk_receive_queue) &&
1331             list_empty(&iucv->message_q.list))
1332                 return 0;
1333
1334         if (flags & (MSG_OOB))
1335                 return -EOPNOTSUPP;
1336
1337         /* receive/dequeue next skb:
1338          * the function understands MSG_PEEK and, thus, does not dequeue skb */
1339         skb = skb_recv_datagram(sk, flags, noblock, &err);
1340         if (!skb) {
1341                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1342                         return 0;
1343                 return err;
1344         }
1345
1346         offset = IUCV_SKB_CB(skb)->offset;
1347         rlen   = skb->len - offset;             /* real length of skb */
1348         copied = min_t(unsigned int, rlen, len);
1349         if (!rlen)
1350                 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1351
1352         cskb = skb;
1353         if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1354                 if (!(flags & MSG_PEEK))
1355                         skb_queue_head(&sk->sk_receive_queue, skb);
1356                 return -EFAULT;
1357         }
1358
1359         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1360         if (sk->sk_type == SOCK_SEQPACKET) {
1361                 if (copied < rlen)
1362                         msg->msg_flags |= MSG_TRUNC;
1363                 /* each iucv message contains a complete record */
1364                 msg->msg_flags |= MSG_EOR;
1365         }
1366
1367         /* create control message to store iucv msg target class:
1368          * get the trgcls from the control buffer of the skb due to
1369          * fragmentation of original iucv message. */
1370         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1371                        sizeof(IUCV_SKB_CB(skb)->class),
1372                        (void *)&IUCV_SKB_CB(skb)->class);
1373         if (err) {
1374                 if (!(flags & MSG_PEEK))
1375                         skb_queue_head(&sk->sk_receive_queue, skb);
1376                 return err;
1377         }
1378
1379         /* Mark read part of skb as used */
1380         if (!(flags & MSG_PEEK)) {
1381
1382                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1383                 if (sk->sk_type == SOCK_STREAM) {
1384                         if (copied < rlen) {
1385                                 IUCV_SKB_CB(skb)->offset = offset + copied;
1386                                 skb_queue_head(&sk->sk_receive_queue, skb);
1387                                 goto done;
1388                         }
1389                 }
1390
1391                 kfree_skb(skb);
1392                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1393                         atomic_inc(&iucv->msg_recv);
1394                         if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1395                                 WARN_ON(1);
1396                                 iucv_sock_close(sk);
1397                                 return -EFAULT;
1398                         }
1399                 }
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                         IUCV_SKB_CB(rskb)->offset = 0;
1406                         if (sock_queue_rcv_skb(sk, rskb)) {
1407                                 skb_queue_head(&iucv->backlog_skb_q,
1408                                                 rskb);
1409                                 break;
1410                         } else {
1411                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1412                         }
1413                 }
1414                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1415                         if (!list_empty(&iucv->message_q.list))
1416                                 iucv_process_message_q(sk);
1417                         if (atomic_read(&iucv->msg_recv) >=
1418                                                         iucv->msglimit / 2) {
1419                                 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1420                                 if (err) {
1421                                         sk->sk_state = IUCV_DISCONN;
1422                                         sk->sk_state_change(sk);
1423                                 }
1424                         }
1425                 }
1426                 spin_unlock_bh(&iucv->message_q.lock);
1427         }
1428
1429 done:
1430         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1431         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1432                 copied = rlen;
1433
1434         return copied;
1435 }
1436
1437 static inline unsigned int iucv_accept_poll(struct sock *parent)
1438 {
1439         struct iucv_sock *isk, *n;
1440         struct sock *sk;
1441
1442         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1443                 sk = (struct sock *) isk;
1444
1445                 if (sk->sk_state == IUCV_CONNECTED)
1446                         return POLLIN | POLLRDNORM;
1447         }
1448
1449         return 0;
1450 }
1451
1452 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1453                             poll_table *wait)
1454 {
1455         struct sock *sk = sock->sk;
1456         unsigned int mask = 0;
1457
1458         sock_poll_wait(file, sk_sleep(sk), wait);
1459
1460         if (sk->sk_state == IUCV_LISTEN)
1461                 return iucv_accept_poll(sk);
1462
1463         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1464                 mask |= POLLERR |
1465                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1466
1467         if (sk->sk_shutdown & RCV_SHUTDOWN)
1468                 mask |= POLLRDHUP;
1469
1470         if (sk->sk_shutdown == SHUTDOWN_MASK)
1471                 mask |= POLLHUP;
1472
1473         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1474             (sk->sk_shutdown & RCV_SHUTDOWN))
1475                 mask |= POLLIN | POLLRDNORM;
1476
1477         if (sk->sk_state == IUCV_CLOSED)
1478                 mask |= POLLHUP;
1479
1480         if (sk->sk_state == IUCV_DISCONN)
1481                 mask |= POLLIN;
1482
1483         if (sock_writeable(sk) && iucv_below_msglim(sk))
1484                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1485         else
1486                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1487
1488         return mask;
1489 }
1490
1491 static int iucv_sock_shutdown(struct socket *sock, int how)
1492 {
1493         struct sock *sk = sock->sk;
1494         struct iucv_sock *iucv = iucv_sk(sk);
1495         struct iucv_message txmsg;
1496         int err = 0;
1497
1498         how++;
1499
1500         if ((how & ~SHUTDOWN_MASK) || !how)
1501                 return -EINVAL;
1502
1503         lock_sock(sk);
1504         switch (sk->sk_state) {
1505         case IUCV_LISTEN:
1506         case IUCV_DISCONN:
1507         case IUCV_CLOSING:
1508         case IUCV_CLOSED:
1509                 err = -ENOTCONN;
1510                 goto fail;
1511         default:
1512                 break;
1513         }
1514
1515         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1516                 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1517                         txmsg.class = 0;
1518                         txmsg.tag = 0;
1519                         err = pr_iucv->message_send(iucv->path, &txmsg,
1520                                 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1521                         if (err) {
1522                                 switch (err) {
1523                                 case 1:
1524                                         err = -ENOTCONN;
1525                                         break;
1526                                 case 2:
1527                                         err = -ECONNRESET;
1528                                         break;
1529                                 default:
1530                                         err = -ENOTCONN;
1531                                         break;
1532                                 }
1533                         }
1534                 } else
1535                         iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1536         }
1537
1538         sk->sk_shutdown |= how;
1539         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1540                 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1541                     iucv->path) {
1542                         err = pr_iucv->path_quiesce(iucv->path, NULL);
1543                         if (err)
1544                                 err = -ENOTCONN;
1545 /*                      skb_queue_purge(&sk->sk_receive_queue); */
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         sock_orphan(sk);
1569         iucv_sock_kill(sk);
1570         return err;
1571 }
1572
1573 /* getsockopt and setsockopt */
1574 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1575                                 char __user *optval, unsigned int optlen)
1576 {
1577         struct sock *sk = sock->sk;
1578         struct iucv_sock *iucv = iucv_sk(sk);
1579         int val;
1580         int rc;
1581
1582         if (level != SOL_IUCV)
1583                 return -ENOPROTOOPT;
1584
1585         if (optlen < sizeof(int))
1586                 return -EINVAL;
1587
1588         if (get_user(val, (int __user *) optval))
1589                 return -EFAULT;
1590
1591         rc = 0;
1592
1593         lock_sock(sk);
1594         switch (optname) {
1595         case SO_IPRMDATA_MSG:
1596                 if (val)
1597                         iucv->flags |= IUCV_IPRMDATA;
1598                 else
1599                         iucv->flags &= ~IUCV_IPRMDATA;
1600                 break;
1601         case SO_MSGLIMIT:
1602                 switch (sk->sk_state) {
1603                 case IUCV_OPEN:
1604                 case IUCV_BOUND:
1605                         if (val < 1 || val > (u16)(~0))
1606                                 rc = -EINVAL;
1607                         else
1608                                 iucv->msglimit = val;
1609                         break;
1610                 default:
1611                         rc = -EINVAL;
1612                         break;
1613                 }
1614                 break;
1615         default:
1616                 rc = -ENOPROTOOPT;
1617                 break;
1618         }
1619         release_sock(sk);
1620
1621         return rc;
1622 }
1623
1624 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1625                                 char __user *optval, int __user *optlen)
1626 {
1627         struct sock *sk = sock->sk;
1628         struct iucv_sock *iucv = iucv_sk(sk);
1629         unsigned int val;
1630         int len;
1631
1632         if (level != SOL_IUCV)
1633                 return -ENOPROTOOPT;
1634
1635         if (get_user(len, optlen))
1636                 return -EFAULT;
1637
1638         if (len < 0)
1639                 return -EINVAL;
1640
1641         len = min_t(unsigned int, len, sizeof(int));
1642
1643         switch (optname) {
1644         case SO_IPRMDATA_MSG:
1645                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1646                 break;
1647         case SO_MSGLIMIT:
1648                 lock_sock(sk);
1649                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1650                                            : iucv->msglimit;    /* default */
1651                 release_sock(sk);
1652                 break;
1653         case SO_MSGSIZE:
1654                 if (sk->sk_state == IUCV_OPEN)
1655                         return -EBADFD;
1656                 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1657                                 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1658                                 0x7fffffff;
1659                 break;
1660         default:
1661                 return -ENOPROTOOPT;
1662         }
1663
1664         if (put_user(len, optlen))
1665                 return -EFAULT;
1666         if (copy_to_user(optval, &val, len))
1667                 return -EFAULT;
1668
1669         return 0;
1670 }
1671
1672
1673 /* Callback wrappers - called from iucv base support */
1674 static int iucv_callback_connreq(struct iucv_path *path,
1675                                  u8 ipvmid[8], u8 ipuser[16])
1676 {
1677         unsigned char user_data[16];
1678         unsigned char nuser_data[16];
1679         unsigned char src_name[8];
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, &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, 0);
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                 iucv_sever_path(nsk, 1);
1754                 iucv_sock_kill(nsk);
1755                 goto fail;
1756         }
1757
1758         iucv_accept_enqueue(sk, nsk);
1759
1760         /* Wake up accept */
1761         nsk->sk_state = IUCV_CONNECTED;
1762         sk->sk_data_ready(sk);
1763         err = 0;
1764 fail:
1765         bh_unlock_sock(sk);
1766         return 0;
1767 }
1768
1769 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1770 {
1771         struct sock *sk = path->private;
1772
1773         sk->sk_state = IUCV_CONNECTED;
1774         sk->sk_state_change(sk);
1775 }
1776
1777 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1778 {
1779         struct sock *sk = path->private;
1780         struct iucv_sock *iucv = iucv_sk(sk);
1781         struct sk_buff *skb;
1782         struct sock_msg_q *save_msg;
1783         int len;
1784
1785         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1786                 pr_iucv->message_reject(path, msg);
1787                 return;
1788         }
1789
1790         spin_lock(&iucv->message_q.lock);
1791
1792         if (!list_empty(&iucv->message_q.list) ||
1793             !skb_queue_empty(&iucv->backlog_skb_q))
1794                 goto save_message;
1795
1796         len = atomic_read(&sk->sk_rmem_alloc);
1797         len += SKB_TRUESIZE(iucv_msg_length(msg));
1798         if (len > sk->sk_rcvbuf)
1799                 goto save_message;
1800
1801         skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1802         if (!skb)
1803                 goto save_message;
1804
1805         iucv_process_message(sk, skb, path, msg);
1806         goto out_unlock;
1807
1808 save_message:
1809         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1810         if (!save_msg)
1811                 goto out_unlock;
1812         save_msg->path = path;
1813         save_msg->msg = *msg;
1814
1815         list_add_tail(&save_msg->list, &iucv->message_q.list);
1816
1817 out_unlock:
1818         spin_unlock(&iucv->message_q.lock);
1819 }
1820
1821 static void iucv_callback_txdone(struct iucv_path *path,
1822                                  struct iucv_message *msg)
1823 {
1824         struct sock *sk = path->private;
1825         struct sk_buff *this = NULL;
1826         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1827         struct sk_buff *list_skb = list->next;
1828         unsigned long flags;
1829
1830         bh_lock_sock(sk);
1831         if (!skb_queue_empty(list)) {
1832                 spin_lock_irqsave(&list->lock, flags);
1833
1834                 while (list_skb != (struct sk_buff *)list) {
1835                         if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
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
1853         if (sk->sk_state == IUCV_CLOSING) {
1854                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1855                         sk->sk_state = IUCV_CLOSED;
1856                         sk->sk_state_change(sk);
1857                 }
1858         }
1859         bh_unlock_sock(sk);
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         if (sk->sk_state == IUCV_CLOSED)
1868                 return;
1869
1870         bh_lock_sock(sk);
1871         iucv_sever_path(sk, 1);
1872         sk->sk_state = IUCV_DISCONN;
1873
1874         sk->sk_state_change(sk);
1875         bh_unlock_sock(sk);
1876 }
1877
1878 /* called if the other communication side shuts down its RECV direction;
1879  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1880  */
1881 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1882 {
1883         struct sock *sk = path->private;
1884
1885         bh_lock_sock(sk);
1886         if (sk->sk_state != IUCV_CLOSED) {
1887                 sk->sk_shutdown |= SEND_SHUTDOWN;
1888                 sk->sk_state_change(sk);
1889         }
1890         bh_unlock_sock(sk);
1891 }
1892
1893 /***************** HiperSockets transport callbacks ********************/
1894 static void afiucv_swap_src_dest(struct sk_buff *skb)
1895 {
1896         struct af_iucv_trans_hdr *trans_hdr =
1897                                 (struct af_iucv_trans_hdr *)skb->data;
1898         char tmpID[8];
1899         char tmpName[8];
1900
1901         ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1902         ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1903         ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1904         ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1905         memcpy(tmpID, trans_hdr->srcUserID, 8);
1906         memcpy(tmpName, trans_hdr->srcAppName, 8);
1907         memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1908         memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1909         memcpy(trans_hdr->destUserID, tmpID, 8);
1910         memcpy(trans_hdr->destAppName, tmpName, 8);
1911         skb_push(skb, ETH_HLEN);
1912         memset(skb->data, 0, ETH_HLEN);
1913 }
1914
1915 /**
1916  * afiucv_hs_callback_syn - react on received SYN
1917  **/
1918 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1919 {
1920         struct sock *nsk;
1921         struct iucv_sock *iucv, *niucv;
1922         struct af_iucv_trans_hdr *trans_hdr;
1923         int err;
1924
1925         iucv = iucv_sk(sk);
1926         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1927         if (!iucv) {
1928                 /* no sock - connection refused */
1929                 afiucv_swap_src_dest(skb);
1930                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1931                 err = dev_queue_xmit(skb);
1932                 goto out;
1933         }
1934
1935         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1936         bh_lock_sock(sk);
1937         if ((sk->sk_state != IUCV_LISTEN) ||
1938             sk_acceptq_is_full(sk) ||
1939             !nsk) {
1940                 /* error on server socket - connection refused */
1941                 afiucv_swap_src_dest(skb);
1942                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1943                 err = dev_queue_xmit(skb);
1944                 iucv_sock_kill(nsk);
1945                 bh_unlock_sock(sk);
1946                 goto out;
1947         }
1948
1949         niucv = iucv_sk(nsk);
1950         iucv_sock_init(nsk, sk);
1951         niucv->transport = AF_IUCV_TRANS_HIPER;
1952         niucv->msglimit = iucv->msglimit;
1953         if (!trans_hdr->window)
1954                 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1955         else
1956                 niucv->msglimit_peer = trans_hdr->window;
1957         memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1958         memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1959         memcpy(niucv->src_name, iucv->src_name, 8);
1960         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1961         nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1962         niucv->hs_dev = iucv->hs_dev;
1963         dev_hold(niucv->hs_dev);
1964         afiucv_swap_src_dest(skb);
1965         trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1966         trans_hdr->window = niucv->msglimit;
1967         /* if receiver acks the xmit connection is established */
1968         err = dev_queue_xmit(skb);
1969         if (!err) {
1970                 iucv_accept_enqueue(sk, nsk);
1971                 nsk->sk_state = IUCV_CONNECTED;
1972                 sk->sk_data_ready(sk);
1973         } else
1974                 iucv_sock_kill(nsk);
1975         bh_unlock_sock(sk);
1976
1977 out:
1978         return NET_RX_SUCCESS;
1979 }
1980
1981 /**
1982  * afiucv_hs_callback_synack() - react on received SYN-ACK
1983  **/
1984 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1985 {
1986         struct iucv_sock *iucv = iucv_sk(sk);
1987         struct af_iucv_trans_hdr *trans_hdr =
1988                                         (struct af_iucv_trans_hdr *)skb->data;
1989
1990         if (!iucv)
1991                 goto out;
1992         if (sk->sk_state != IUCV_BOUND)
1993                 goto out;
1994         bh_lock_sock(sk);
1995         iucv->msglimit_peer = trans_hdr->window;
1996         sk->sk_state = IUCV_CONNECTED;
1997         sk->sk_state_change(sk);
1998         bh_unlock_sock(sk);
1999 out:
2000         kfree_skb(skb);
2001         return NET_RX_SUCCESS;
2002 }
2003
2004 /**
2005  * afiucv_hs_callback_synfin() - react on received SYN_FIN
2006  **/
2007 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2008 {
2009         struct iucv_sock *iucv = iucv_sk(sk);
2010
2011         if (!iucv)
2012                 goto out;
2013         if (sk->sk_state != IUCV_BOUND)
2014                 goto out;
2015         bh_lock_sock(sk);
2016         sk->sk_state = IUCV_DISCONN;
2017         sk->sk_state_change(sk);
2018         bh_unlock_sock(sk);
2019 out:
2020         kfree_skb(skb);
2021         return NET_RX_SUCCESS;
2022 }
2023
2024 /**
2025  * afiucv_hs_callback_fin() - react on received FIN
2026  **/
2027 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2028 {
2029         struct iucv_sock *iucv = iucv_sk(sk);
2030
2031         /* other end of connection closed */
2032         if (!iucv)
2033                 goto out;
2034         bh_lock_sock(sk);
2035         if (sk->sk_state == IUCV_CONNECTED) {
2036                 sk->sk_state = IUCV_DISCONN;
2037                 sk->sk_state_change(sk);
2038         }
2039         bh_unlock_sock(sk);
2040 out:
2041         kfree_skb(skb);
2042         return NET_RX_SUCCESS;
2043 }
2044
2045 /**
2046  * afiucv_hs_callback_win() - react on received WIN
2047  **/
2048 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2049 {
2050         struct iucv_sock *iucv = iucv_sk(sk);
2051         struct af_iucv_trans_hdr *trans_hdr =
2052                                         (struct af_iucv_trans_hdr *)skb->data;
2053
2054         if (!iucv)
2055                 return NET_RX_SUCCESS;
2056
2057         if (sk->sk_state != IUCV_CONNECTED)
2058                 return NET_RX_SUCCESS;
2059
2060         atomic_sub(trans_hdr->window, &iucv->msg_sent);
2061         iucv_sock_wake_msglim(sk);
2062         return NET_RX_SUCCESS;
2063 }
2064
2065 /**
2066  * afiucv_hs_callback_rx() - react on received data
2067  **/
2068 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2069 {
2070         struct iucv_sock *iucv = iucv_sk(sk);
2071
2072         if (!iucv) {
2073                 kfree_skb(skb);
2074                 return NET_RX_SUCCESS;
2075         }
2076
2077         if (sk->sk_state != IUCV_CONNECTED) {
2078                 kfree_skb(skb);
2079                 return NET_RX_SUCCESS;
2080         }
2081
2082         if (sk->sk_shutdown & RCV_SHUTDOWN) {
2083                 kfree_skb(skb);
2084                 return NET_RX_SUCCESS;
2085         }
2086
2087         /* write stuff from iucv_msg to skb cb */
2088         skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2089         skb_reset_transport_header(skb);
2090         skb_reset_network_header(skb);
2091         IUCV_SKB_CB(skb)->offset = 0;
2092         spin_lock(&iucv->message_q.lock);
2093         if (skb_queue_empty(&iucv->backlog_skb_q)) {
2094                 if (sock_queue_rcv_skb(sk, skb)) {
2095                         /* handle rcv queue full */
2096                         skb_queue_tail(&iucv->backlog_skb_q, skb);
2097                 }
2098         } else
2099                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2100         spin_unlock(&iucv->message_q.lock);
2101         return NET_RX_SUCCESS;
2102 }
2103
2104 /**
2105  * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2106  *                   transport
2107  *                   called from netif RX softirq
2108  **/
2109 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2110         struct packet_type *pt, struct net_device *orig_dev)
2111 {
2112         struct sock *sk;
2113         struct iucv_sock *iucv;
2114         struct af_iucv_trans_hdr *trans_hdr;
2115         char nullstring[8];
2116         int err = 0;
2117
2118         if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2119                 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2120                           (int)skb->len,
2121                           (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2122                 kfree_skb(skb);
2123                 return NET_RX_SUCCESS;
2124         }
2125         if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2126                 if (skb_linearize(skb)) {
2127                         WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2128                                   (int)skb->len);
2129                         kfree_skb(skb);
2130                         return NET_RX_SUCCESS;
2131                 }
2132         skb_pull(skb, ETH_HLEN);
2133         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2134         EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2135         EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2136         EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2137         EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2138         memset(nullstring, 0, sizeof(nullstring));
2139         iucv = NULL;
2140         sk = NULL;
2141         read_lock(&iucv_sk_list.lock);
2142         sk_for_each(sk, &iucv_sk_list.head) {
2143                 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2144                         if ((!memcmp(&iucv_sk(sk)->src_name,
2145                                      trans_hdr->destAppName, 8)) &&
2146                             (!memcmp(&iucv_sk(sk)->src_user_id,
2147                                      trans_hdr->destUserID, 8)) &&
2148                             (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2149                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2150                                      nullstring, 8))) {
2151                                 iucv = iucv_sk(sk);
2152                                 break;
2153                         }
2154                 } else {
2155                         if ((!memcmp(&iucv_sk(sk)->src_name,
2156                                      trans_hdr->destAppName, 8)) &&
2157                             (!memcmp(&iucv_sk(sk)->src_user_id,
2158                                      trans_hdr->destUserID, 8)) &&
2159                             (!memcmp(&iucv_sk(sk)->dst_name,
2160                                      trans_hdr->srcAppName, 8)) &&
2161                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2162                                      trans_hdr->srcUserID, 8))) {
2163                                 iucv = iucv_sk(sk);
2164                                 break;
2165                         }
2166                 }
2167         }
2168         read_unlock(&iucv_sk_list.lock);
2169         if (!iucv)
2170                 sk = NULL;
2171
2172         /* no sock
2173         how should we send with no sock
2174         1) send without sock no send rc checking?
2175         2) introduce default sock to handle this cases
2176
2177          SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2178          data -> send FIN
2179          SYN|ACK, SYN|FIN, FIN -> no action? */
2180
2181         switch (trans_hdr->flags) {
2182         case AF_IUCV_FLAG_SYN:
2183                 /* connect request */
2184                 err = afiucv_hs_callback_syn(sk, skb);
2185                 break;
2186         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2187                 /* connect request confirmed */
2188                 err = afiucv_hs_callback_synack(sk, skb);
2189                 break;
2190         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2191                 /* connect request refused */
2192                 err = afiucv_hs_callback_synfin(sk, skb);
2193                 break;
2194         case (AF_IUCV_FLAG_FIN):
2195                 /* close request */
2196                 err = afiucv_hs_callback_fin(sk, skb);
2197                 break;
2198         case (AF_IUCV_FLAG_WIN):
2199                 err = afiucv_hs_callback_win(sk, skb);
2200                 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2201                         kfree_skb(skb);
2202                         break;
2203                 }
2204                 /* fall through and receive non-zero length data */
2205         case (AF_IUCV_FLAG_SHT):
2206                 /* shutdown request */
2207                 /* fall through and receive zero length data */
2208         case 0:
2209                 /* plain data frame */
2210                 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2211                 err = afiucv_hs_callback_rx(sk, skb);
2212                 break;
2213         default:
2214                 ;
2215         }
2216
2217         return err;
2218 }
2219
2220 /**
2221  * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2222  *                                 transport
2223  **/
2224 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2225                                         enum iucv_tx_notify n)
2226 {
2227         struct sock *isk = skb->sk;
2228         struct sock *sk = NULL;
2229         struct iucv_sock *iucv = NULL;
2230         struct sk_buff_head *list;
2231         struct sk_buff *list_skb;
2232         struct sk_buff *nskb;
2233         unsigned long flags;
2234
2235         read_lock_irqsave(&iucv_sk_list.lock, flags);
2236         sk_for_each(sk, &iucv_sk_list.head)
2237                 if (sk == isk) {
2238                         iucv = iucv_sk(sk);
2239                         break;
2240                 }
2241         read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2242
2243         if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2244                 return;
2245
2246         list = &iucv->send_skb_q;
2247         spin_lock_irqsave(&list->lock, flags);
2248         if (skb_queue_empty(list))
2249                 goto out_unlock;
2250         list_skb = list->next;
2251         nskb = list_skb->next;
2252         while (list_skb != (struct sk_buff *)list) {
2253                 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2254                         switch (n) {
2255                         case TX_NOTIFY_OK:
2256                                 __skb_unlink(list_skb, list);
2257                                 kfree_skb(list_skb);
2258                                 iucv_sock_wake_msglim(sk);
2259                                 break;
2260                         case TX_NOTIFY_PENDING:
2261                                 atomic_inc(&iucv->pendings);
2262                                 break;
2263                         case TX_NOTIFY_DELAYED_OK:
2264                                 __skb_unlink(list_skb, list);
2265                                 atomic_dec(&iucv->pendings);
2266                                 if (atomic_read(&iucv->pendings) <= 0)
2267                                         iucv_sock_wake_msglim(sk);
2268                                 kfree_skb(list_skb);
2269                                 break;
2270                         case TX_NOTIFY_UNREACHABLE:
2271                         case TX_NOTIFY_DELAYED_UNREACHABLE:
2272                         case TX_NOTIFY_TPQFULL: /* not yet used */
2273                         case TX_NOTIFY_GENERALERROR:
2274                         case TX_NOTIFY_DELAYED_GENERALERROR:
2275                                 __skb_unlink(list_skb, list);
2276                                 kfree_skb(list_skb);
2277                                 if (sk->sk_state == IUCV_CONNECTED) {
2278                                         sk->sk_state = IUCV_DISCONN;
2279                                         sk->sk_state_change(sk);
2280                                 }
2281                                 break;
2282                         }
2283                         break;
2284                 }
2285                 list_skb = nskb;
2286                 nskb = nskb->next;
2287         }
2288 out_unlock:
2289         spin_unlock_irqrestore(&list->lock, flags);
2290
2291         if (sk->sk_state == IUCV_CLOSING) {
2292                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2293                         sk->sk_state = IUCV_CLOSED;
2294                         sk->sk_state_change(sk);
2295                 }
2296         }
2297
2298 }
2299
2300 /*
2301  * afiucv_netdev_event: handle netdev notifier chain events
2302  */
2303 static int afiucv_netdev_event(struct notifier_block *this,
2304                                unsigned long event, void *ptr)
2305 {
2306         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2307         struct sock *sk;
2308         struct iucv_sock *iucv;
2309
2310         switch (event) {
2311         case NETDEV_REBOOT:
2312         case NETDEV_GOING_DOWN:
2313                 sk_for_each(sk, &iucv_sk_list.head) {
2314                         iucv = iucv_sk(sk);
2315                         if ((iucv->hs_dev == event_dev) &&
2316                             (sk->sk_state == IUCV_CONNECTED)) {
2317                                 if (event == NETDEV_GOING_DOWN)
2318                                         iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2319                                 sk->sk_state = IUCV_DISCONN;
2320                                 sk->sk_state_change(sk);
2321                         }
2322                 }
2323                 break;
2324         case NETDEV_DOWN:
2325         case NETDEV_UNREGISTER:
2326         default:
2327                 break;
2328         }
2329         return NOTIFY_DONE;
2330 }
2331
2332 static struct notifier_block afiucv_netdev_notifier = {
2333         .notifier_call = afiucv_netdev_event,
2334 };
2335
2336 static const struct proto_ops iucv_sock_ops = {
2337         .family         = PF_IUCV,
2338         .owner          = THIS_MODULE,
2339         .release        = iucv_sock_release,
2340         .bind           = iucv_sock_bind,
2341         .connect        = iucv_sock_connect,
2342         .listen         = iucv_sock_listen,
2343         .accept         = iucv_sock_accept,
2344         .getname        = iucv_sock_getname,
2345         .sendmsg        = iucv_sock_sendmsg,
2346         .recvmsg        = iucv_sock_recvmsg,
2347         .poll           = iucv_sock_poll,
2348         .ioctl          = sock_no_ioctl,
2349         .mmap           = sock_no_mmap,
2350         .socketpair     = sock_no_socketpair,
2351         .shutdown       = iucv_sock_shutdown,
2352         .setsockopt     = iucv_sock_setsockopt,
2353         .getsockopt     = iucv_sock_getsockopt,
2354 };
2355
2356 static const struct net_proto_family iucv_sock_family_ops = {
2357         .family = AF_IUCV,
2358         .owner  = THIS_MODULE,
2359         .create = iucv_sock_create,
2360 };
2361
2362 static struct packet_type iucv_packet_type = {
2363         .type = cpu_to_be16(ETH_P_AF_IUCV),
2364         .func = afiucv_hs_rcv,
2365 };
2366
2367 static int afiucv_iucv_init(void)
2368 {
2369         int err;
2370
2371         err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2372         if (err)
2373                 goto out;
2374         /* establish dummy device */
2375         af_iucv_driver.bus = pr_iucv->bus;
2376         err = driver_register(&af_iucv_driver);
2377         if (err)
2378                 goto out_iucv;
2379         af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2380         if (!af_iucv_dev) {
2381                 err = -ENOMEM;
2382                 goto out_driver;
2383         }
2384         dev_set_name(af_iucv_dev, "af_iucv");
2385         af_iucv_dev->bus = pr_iucv->bus;
2386         af_iucv_dev->parent = pr_iucv->root;
2387         af_iucv_dev->release = (void (*)(struct device *))kfree;
2388         af_iucv_dev->driver = &af_iucv_driver;
2389         err = device_register(af_iucv_dev);
2390         if (err)
2391                 goto out_driver;
2392         return 0;
2393
2394 out_driver:
2395         driver_unregister(&af_iucv_driver);
2396 out_iucv:
2397         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2398 out:
2399         return err;
2400 }
2401
2402 static int __init afiucv_init(void)
2403 {
2404         int err;
2405
2406         if (MACHINE_IS_VM) {
2407                 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2408                 if (unlikely(err)) {
2409                         WARN_ON(err);
2410                         err = -EPROTONOSUPPORT;
2411                         goto out;
2412                 }
2413
2414                 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2415                 if (!pr_iucv) {
2416                         printk(KERN_WARNING "iucv_if lookup failed\n");
2417                         memset(&iucv_userid, 0, sizeof(iucv_userid));
2418                 }
2419         } else {
2420                 memset(&iucv_userid, 0, sizeof(iucv_userid));
2421                 pr_iucv = NULL;
2422         }
2423
2424         err = proto_register(&iucv_proto, 0);
2425         if (err)
2426                 goto out;
2427         err = sock_register(&iucv_sock_family_ops);
2428         if (err)
2429                 goto out_proto;
2430
2431         if (pr_iucv) {
2432                 err = afiucv_iucv_init();
2433                 if (err)
2434                         goto out_sock;
2435         } else
2436                 register_netdevice_notifier(&afiucv_netdev_notifier);
2437         dev_add_pack(&iucv_packet_type);
2438         return 0;
2439
2440 out_sock:
2441         sock_unregister(PF_IUCV);
2442 out_proto:
2443         proto_unregister(&iucv_proto);
2444 out:
2445         if (pr_iucv)
2446                 symbol_put(iucv_if);
2447         return err;
2448 }
2449
2450 static void __exit afiucv_exit(void)
2451 {
2452         if (pr_iucv) {
2453                 device_unregister(af_iucv_dev);
2454                 driver_unregister(&af_iucv_driver);
2455                 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2456                 symbol_put(iucv_if);
2457         } else
2458                 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2459         dev_remove_pack(&iucv_packet_type);
2460         sock_unregister(PF_IUCV);
2461         proto_unregister(&iucv_proto);
2462 }
2463
2464 module_init(afiucv_init);
2465 module_exit(afiucv_exit);
2466
2467 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2468 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2469 MODULE_VERSION(VERSION);
2470 MODULE_LICENSE("GPL");
2471 MODULE_ALIAS_NETPROTO(PF_IUCV);
2472