net/iucv/af_iucv.c

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