net/iucv/af_iucv.c

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