net/iucv/af_iucv.c

   1 /*
   2  *  IUCV protocol stack for Linux on zSeries
   3  *
   4  *  Copyright IBM Corp. 2006, 2009
   5  *
   6  *  Author(s):  Jennifer Hunt <jenhunt@us.ibm.com>
   7  *              Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
   8  *  PM functions:
   9  *              Ursula Braun <ursula.braun@de.ibm.com>
  10  */
  11
  12 #define KMSG_COMPONENT "af_iucv"
  13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/list.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/slab.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/init.h>
  24 #include <linux/poll.h>
  25 #include <net/sock.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/cpcmd.h>
  28 #include <linux/kmod.h>
  29
  30 #include <net/iucv/af_iucv.h>
  31
  32 #define VERSION "1.2"
  33
  34 static char iucv_userid[80];
  35
  36 static const struct proto_ops iucv_sock_ops;
  37
  38 static struct proto iucv_proto = {
  39         .name           = "AF_IUCV",
  40         .owner          = THIS_MODULE,
  41         .obj_size       = sizeof(struct iucv_sock),
  42 };
  43
  44 static struct iucv_interface *pr_iucv;
  45
  46 /* special AF_IUCV IPRM messages */
  47 static const u8 iprm_shutdown[8] =
  48         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
  49
  50 #define TRGCLS_SIZE     (sizeof(((struct iucv_message *)0)->class))
  51
  52 #define __iucv_sock_wait(sk, condition, timeo, ret)                     \
  53 do {                                                                    \
  54         DEFINE_WAIT(__wait);                                            \
  55         long __timeo = timeo;                                           \
  56         ret = 0;                                                        \
  57         prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE);     \
  58         while (!(condition)) {                                          \
  59                 if (!__timeo) {                                         \
  60                         ret = -EAGAIN;                                  \
  61                         break;                                          \
  62                 }                                                       \
  63                 if (signal_pending(current)) {                          \
  64                         ret = sock_intr_errno(__timeo);                 \
  65                         break;                                          \
  66                 }                                                       \
  67                 release_sock(sk);                                       \
  68                 __timeo = schedule_timeout(__timeo);                    \
  69                 lock_sock(sk);                                          \
  70                 ret = sock_error(sk);                                   \
  71                 if (ret)                                                \
  72                         break;                                          \
  73         }                                                               \
  74         finish_wait(sk_sleep(sk), &__wait);                             \
  75 } while (0)
  76
  77 #define iucv_sock_wait(sk, condition, timeo)                            \
  78 ({                                                                      \
  79         int __ret = 0;                                                  \
  80         if (!(condition))                                               \
  81                 __iucv_sock_wait(sk, condition, timeo, __ret);          \
  82         __ret;                                                          \
  83 })
  84
  85 static void iucv_sock_kill(struct sock *sk);
  86 static void iucv_sock_close(struct sock *sk);
  87 static void iucv_sever_path(struct sock *, int);
  88
  89 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
  90         struct packet_type *pt, struct net_device *orig_dev);
  91 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
  92                    struct sk_buff *skb, u8 flags);
  93 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
  94
  95 /* Call Back functions */
  96 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  97 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
  98 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
  99 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
 100                                  u8 ipuser[16]);
 101 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
 102 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
 103
 104 static struct iucv_sock_list iucv_sk_list = {
 105         .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
 106         .autobind_name = ATOMIC_INIT(0)
 107 };
 108
 109 static struct iucv_handler af_iucv_handler = {
 110         .path_pending     = iucv_callback_connreq,
 111         .path_complete    = iucv_callback_connack,
 112         .path_severed     = iucv_callback_connrej,
 113         .message_pending  = iucv_callback_rx,
 114         .message_complete = iucv_callback_txdone,
 115         .path_quiesced    = iucv_callback_shutdown,
 116 };
 117
 118 static inline void high_nmcpy(unsigned char *dst, char *src)
 119 {
 120        memcpy(dst, src, 8);
 121 }
 122
 123 static inline void low_nmcpy(unsigned char *dst, char *src)
 124 {
 125        memcpy(&dst[8], src, 8);
 126 }
 127
 128 static int afiucv_pm_prepare(struct device *dev)
 129 {
 130 #ifdef CONFIG_PM_DEBUG
 131         printk(KERN_WARNING "afiucv_pm_prepare\n");
 132 #endif
 133         return 0;
 134 }
 135
 136 static void afiucv_pm_complete(struct device *dev)
 137 {
 138 #ifdef CONFIG_PM_DEBUG
 139         printk(KERN_WARNING "afiucv_pm_complete\n");
 140 #endif
 141 }
 142
 143 /**
 144  * afiucv_pm_freeze() - Freeze PM callback
 145  * @dev:        AFIUCV dummy device
 146  *
 147  * Sever all established IUCV communication pathes
 148  */
 149 static int afiucv_pm_freeze(struct device *dev)
 150 {
 151         struct iucv_sock *iucv;
 152         struct sock *sk;
 153         int err = 0;
 154
 155 #ifdef CONFIG_PM_DEBUG
 156         printk(KERN_WARNING "afiucv_pm_freeze\n");
 157 #endif
 158         read_lock(&iucv_sk_list.lock);
 159         sk_for_each(sk, &iucv_sk_list.head) {
 160                 iucv = iucv_sk(sk);
 161                 switch (sk->sk_state) {
 162                 case IUCV_DISCONN:
 163                 case IUCV_CLOSING:
 164                 case IUCV_CONNECTED:
 165                         iucv_sever_path(sk, 0);
 166                         break;
 167                 case IUCV_OPEN:
 168                 case IUCV_BOUND:
 169                 case IUCV_LISTEN:
 170                 case IUCV_CLOSED:
 171                 default:
 172                         break;
 173                 }
 174                 skb_queue_purge(&iucv->send_skb_q);
 175                 skb_queue_purge(&iucv->backlog_skb_q);
 176         }
 177         read_unlock(&iucv_sk_list.lock);
 178         return err;
 179 }
 180
 181 /**
 182  * afiucv_pm_restore_thaw() - Thaw and restore PM callback
 183  * @dev:        AFIUCV dummy device
 184  *
 185  * socket clean up after freeze
 186  */
 187 static int afiucv_pm_restore_thaw(struct device *dev)
 188 {
 189         struct sock *sk;
 190
 191 #ifdef CONFIG_PM_DEBUG
 192         printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
 193 #endif
 194         read_lock(&iucv_sk_list.lock);
 195         sk_for_each(sk, &iucv_sk_list.head) {
 196                 switch (sk->sk_state) {
 197                 case IUCV_CONNECTED:
 198                         sk->sk_err = EPIPE;
 199                         sk->sk_state = IUCV_DISCONN;
 200                         sk->sk_state_change(sk);
 201                         break;
 202                 case IUCV_DISCONN:
 203                 case IUCV_CLOSING:
 204                 case IUCV_LISTEN:
 205                 case IUCV_BOUND:
 206                 case IUCV_OPEN:
 207                 default:
 208                         break;
 209                 }
 210         }
 211         read_unlock(&iucv_sk_list.lock);
 212         return 0;
 213 }
 214
 215 static const struct dev_pm_ops afiucv_pm_ops = {
 216         .prepare = afiucv_pm_prepare,
 217         .complete = afiucv_pm_complete,
 218         .freeze = afiucv_pm_freeze,
 219         .thaw = afiucv_pm_restore_thaw,
 220         .restore = afiucv_pm_restore_thaw,
 221 };
 222
 223 static struct device_driver af_iucv_driver = {
 224         .owner = THIS_MODULE,
 225         .name = "afiucv",
 226         .bus  = NULL,
 227         .pm   = &afiucv_pm_ops,
 228 };
 229
 230 /* dummy device used as trigger for PM functions */
 231 static struct device *af_iucv_dev;
 232
 233 /**
 234  * iucv_msg_length() - Returns the length of an iucv message.
 235  * @msg:        Pointer to struct iucv_message, MUST NOT be NULL
 236  *
 237  * The function returns the length of the specified iucv message @msg of data
 238  * stored in a buffer and of data stored in the parameter list (PRMDATA).
 239  *
 240  * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
 241  * data:
 242  *      PRMDATA[0..6]   socket data (max 7 bytes);
 243  *      PRMDATA[7]      socket data length value (len is 0xff - PRMDATA[7])
 244  *
 245  * The socket data length is computed by subtracting the socket data length
 246  * value from 0xFF.
 247  * If the socket data len is greater 7, then PRMDATA can be used for special
 248  * notifications (see iucv_sock_shutdown); and further,
 249  * if the socket data len is > 7, the function returns 8.
 250  *
 251  * Use this function to allocate socket buffers to store iucv message data.
 252  */
 253 static inline size_t iucv_msg_length(struct iucv_message *msg)
 254 {
 255         size_t datalen;
 256
 257         if (msg->flags & IUCV_IPRMDATA) {
 258                 datalen = 0xff - msg->rmmsg[7];
 259                 return (datalen < 8) ? datalen : 8;
 260         }
 261         return msg->length;
 262 }
 263
 264 /**
 265  * iucv_sock_in_state() - check for specific states
 266  * @sk:         sock structure
 267  * @state:      first iucv sk state
 268  * @state:      second iucv sk state
 269  *
 270  * Returns true if the socket in either in the first or second state.
 271  */
 272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
 273 {
 274         return (sk->sk_state == state || sk->sk_state == state2);
 275 }
 276
 277 /**
 278  * iucv_below_msglim() - function to check if messages can be sent
 279  * @sk:         sock structure
 280  *
 281  * Returns true if the send queue length is lower than the message limit.
 282  * Always returns true if the socket is not connected (no iucv path for
 283  * checking the message limit).
 284  */
 285 static inline int iucv_below_msglim(struct sock *sk)
 286 {
 287         struct iucv_sock *iucv = iucv_sk(sk);
 288
 289         if (sk->sk_state != IUCV_CONNECTED)
 290                 return 1;
 291         if (iucv->transport == AF_IUCV_TRANS_IUCV)
 292                 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
 293         else
 294                 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
 295                         (atomic_read(&iucv->pendings) <= 0));
 296 }
 297
 298 /**
 299  * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
 300  */
 301 static void iucv_sock_wake_msglim(struct sock *sk)
 302 {
 303         struct socket_wq *wq;
 304
 305         rcu_read_lock();
 306         wq = rcu_dereference(sk->sk_wq);
 307         if (wq_has_sleeper(wq))
 308                 wake_up_interruptible_all(&wq->wait);
 309         sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 310         rcu_read_unlock();
 311 }
 312
 313 /**
 314  * afiucv_hs_send() - send a message through HiperSockets transport
 315  */
 316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
 317                    struct sk_buff *skb, u8 flags)
 318 {
 319         struct iucv_sock *iucv = iucv_sk(sock);
 320         struct af_iucv_trans_hdr *phs_hdr;
 321         struct sk_buff *nskb;
 322         int err, confirm_recv = 0;
 323
 324         memset(skb->head, 0, ETH_HLEN);
 325         phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
 326                                         sizeof(struct af_iucv_trans_hdr));
 327         skb_reset_mac_header(skb);
 328         skb_reset_network_header(skb);
 329         skb_push(skb, ETH_HLEN);
 330         skb_reset_mac_header(skb);
 331         memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
 332
 333         phs_hdr->magic = ETH_P_AF_IUCV;
 334         phs_hdr->version = 1;
 335         phs_hdr->flags = flags;
 336         if (flags == AF_IUCV_FLAG_SYN)
 337                 phs_hdr->window = iucv->msglimit;
 338         else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
 339                 confirm_recv = atomic_read(&iucv->msg_recv);
 340                 phs_hdr->window = confirm_recv;
 341                 if (confirm_recv)
 342                         phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
 343         }
 344         memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
 345         memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
 346         memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
 347         memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
 348         ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
 349         ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
 350         ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
 351         ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
 352         if (imsg)
 353                 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
 354
 355         skb->dev = iucv->hs_dev;
 356         if (!skb->dev)
 357                 return -ENODEV;
 358         if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
 359                 return -ENETDOWN;
 360         if (skb->len > skb->dev->mtu) {
 361                 if (sock->sk_type == SOCK_SEQPACKET)
 362                         return -EMSGSIZE;
 363                 else
 364                         skb_trim(skb, skb->dev->mtu);
 365         }
 366         skb->protocol = ETH_P_AF_IUCV;
 367         nskb = skb_clone(skb, GFP_ATOMIC);
 368         if (!nskb)
 369                 return -ENOMEM;
 370         skb_queue_tail(&iucv->send_skb_q, nskb);
 371         err = dev_queue_xmit(skb);
 372         if (net_xmit_eval(err)) {
 373                 skb_unlink(nskb, &iucv->send_skb_q);
 374                 kfree_skb(nskb);
 375         } else {
 376                 atomic_sub(confirm_recv, &iucv->msg_recv);
 377                 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
 378         }
 379         return net_xmit_eval(err);
 380 }
 381
 382 static struct sock *__iucv_get_sock_by_name(char *nm)
 383 {
 384         struct sock *sk;
 385
 386         sk_for_each(sk, &iucv_sk_list.head)
 387                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 388                         return sk;
 389
 390         return NULL;
 391 }
 392
 393 static void iucv_sock_destruct(struct sock *sk)
 394 {
 395         skb_queue_purge(&sk->sk_receive_queue);
 396         skb_queue_purge(&sk->sk_error_queue);
 397
 398         sk_mem_reclaim(sk);
 399
 400         if (!sock_flag(sk, SOCK_DEAD)) {
 401                 pr_err("Attempt to release alive iucv socket %p\n", sk);
 402                 return;
 403         }
 404
 405         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 406         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 407         WARN_ON(sk->sk_wmem_queued);
 408         WARN_ON(sk->sk_forward_alloc);
 409 }
 410
 411 /* Cleanup Listen */
 412 static void iucv_sock_cleanup_listen(struct sock *parent)
 413 {
 414         struct sock *sk;
 415
 416         /* Close non-accepted connections */
 417         while ((sk = iucv_accept_dequeue(parent, NULL))) {
 418                 iucv_sock_close(sk);
 419                 iucv_sock_kill(sk);
 420         }
 421
 422         parent->sk_state = IUCV_CLOSED;
 423 }
 424
 425 /* Kill socket (only if zapped and orphaned) */
 426 static void iucv_sock_kill(struct sock *sk)
 427 {
 428         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 429                 return;
 430
 431         iucv_sock_unlink(&iucv_sk_list, sk);
 432         sock_set_flag(sk, SOCK_DEAD);
 433         sock_put(sk);
 434 }
 435
 436 /* Terminate an IUCV path */
 437 static void iucv_sever_path(struct sock *sk, int with_user_data)
 438 {
 439         unsigned char user_data[16];
 440         struct iucv_sock *iucv = iucv_sk(sk);
 441         struct iucv_path *path = iucv->path;
 442
 443         if (iucv->path) {
 444                 iucv->path = NULL;
 445                 if (with_user_data) {
 446                         low_nmcpy(user_data, iucv->src_name);
 447                         high_nmcpy(user_data, iucv->dst_name);
 448                         ASCEBC(user_data, sizeof(user_data));
 449                         pr_iucv->path_sever(path, user_data);
 450                 } else
 451                         pr_iucv->path_sever(path, NULL);
 452                 iucv_path_free(path);
 453         }
 454 }
 455
 456 /* Send FIN through an IUCV socket for HIPER transport */
 457 static int iucv_send_ctrl(struct sock *sk, u8 flags)
 458 {
 459         int err = 0;
 460         int blen;
 461         struct sk_buff *skb;
 462
 463         blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
 464         skb = sock_alloc_send_skb(sk, blen, 1, &err);
 465         if (skb) {
 466                 skb_reserve(skb, blen);
 467                 err = afiucv_hs_send(NULL, sk, skb, flags);
 468         }
 469         return err;
 470 }
 471
 472 /* Close an IUCV socket */
 473 static void iucv_sock_close(struct sock *sk)
 474 {
 475         struct iucv_sock *iucv = iucv_sk(sk);
 476         unsigned long timeo;
 477         int err = 0;
 478
 479         lock_sock(sk);
 480
 481         switch (sk->sk_state) {
 482         case IUCV_LISTEN:
 483                 iucv_sock_cleanup_listen(sk);
 484                 break;
 485
 486         case IUCV_CONNECTED:
 487                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
 488                         err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
 489                         sk->sk_state = IUCV_DISCONN;
 490                         sk->sk_state_change(sk);
 491                 }
 492         case IUCV_DISCONN:   /* fall through */
 493                 sk->sk_state = IUCV_CLOSING;
 494                 sk->sk_state_change(sk);
 495
 496                 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
 497                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 498                                 timeo = sk->sk_lingertime;
 499                         else
 500                                 timeo = IUCV_DISCONN_TIMEOUT;
 501                         iucv_sock_wait(sk,
 502                                         iucv_sock_in_state(sk, IUCV_CLOSED, 0),
 503                                         timeo);
 504                 }
 505
 506         case IUCV_CLOSING:   /* fall through */
 507                 sk->sk_state = IUCV_CLOSED;
 508                 sk->sk_state_change(sk);
 509
 510                 sk->sk_err = ECONNRESET;
 511                 sk->sk_state_change(sk);
 512
 513                 skb_queue_purge(&iucv->send_skb_q);
 514                 skb_queue_purge(&iucv->backlog_skb_q);
 515
 516         default:   /* fall through */
 517                 iucv_sever_path(sk, 1);
 518         }
 519
 520         if (iucv->hs_dev) {
 521                 dev_put(iucv->hs_dev);
 522                 iucv->hs_dev = NULL;
 523                 sk->sk_bound_dev_if = 0;
 524         }
 525
 526         /* mark socket for deletion by iucv_sock_kill() */
 527         sock_set_flag(sk, SOCK_ZAPPED);
 528
 529         release_sock(sk);
 530 }
 531
 532 static void iucv_sock_init(struct sock *sk, struct sock *parent)
 533 {
 534         if (parent)
 535                 sk->sk_type = parent->sk_type;
 536 }
 537
 538 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
 539 {
 540         struct sock *sk;
 541         struct iucv_sock *iucv;
 542
 543         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
 544         if (!sk)
 545                 return NULL;
 546         iucv = iucv_sk(sk);
 547
 548         sock_init_data(sock, sk);
 549         INIT_LIST_HEAD(&iucv->accept_q);
 550         spin_lock_init(&iucv->accept_q_lock);
 551         skb_queue_head_init(&iucv->send_skb_q);
 552         INIT_LIST_HEAD(&iucv->message_q.list);
 553         spin_lock_init(&iucv->message_q.lock);
 554         skb_queue_head_init(&iucv->backlog_skb_q);
 555         iucv->send_tag = 0;
 556         atomic_set(&iucv->pendings, 0);
 557         iucv->flags = 0;
 558         iucv->msglimit = 0;
 559         atomic_set(&iucv->msg_sent, 0);
 560         atomic_set(&iucv->msg_recv, 0);
 561         iucv->path = NULL;
 562         iucv->sk_txnotify = afiucv_hs_callback_txnotify;
 563         memset(&iucv->src_user_id , 0, 32);
 564         if (pr_iucv)
 565                 iucv->transport = AF_IUCV_TRANS_IUCV;
 566         else
 567                 iucv->transport = AF_IUCV_TRANS_HIPER;
 568
 569         sk->sk_destruct = iucv_sock_destruct;
 570         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 571         sk->sk_allocation = GFP_DMA;
 572
 573         sock_reset_flag(sk, SOCK_ZAPPED);
 574
 575         sk->sk_protocol = proto;
 576         sk->sk_state    = IUCV_OPEN;
 577
 578         iucv_sock_link(&iucv_sk_list, sk);
 579         return sk;
 580 }
 581
 582 /* Create an IUCV socket */
 583 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
 584                             int kern)
 585 {
 586         struct sock *sk;
 587
 588         if (protocol && protocol != PF_IUCV)
 589                 return -EPROTONOSUPPORT;
 590
 591         sock->state = SS_UNCONNECTED;
 592
 593         switch (sock->type) {
 594         case SOCK_STREAM:
 595                 sock->ops = &iucv_sock_ops;
 596                 break;
 597         case SOCK_SEQPACKET:
 598                 /* currently, proto ops can handle both sk types */
 599                 sock->ops = &iucv_sock_ops;
 600                 break;
 601         default:
 602                 return -ESOCKTNOSUPPORT;
 603         }
 604
 605         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
 606         if (!sk)
 607                 return -ENOMEM;
 608
 609         iucv_sock_init(sk, NULL);
 610
 611         return 0;
 612 }
 613
 614 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 615 {
 616         write_lock_bh(&l->lock);
 617         sk_add_node(sk, &l->head);
 618         write_unlock_bh(&l->lock);
 619 }
 620
 621 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 622 {
 623         write_lock_bh(&l->lock);
 624         sk_del_node_init(sk);
 625         write_unlock_bh(&l->lock);
 626 }
 627
 628 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 629 {
 630         unsigned long flags;
 631         struct iucv_sock *par = iucv_sk(parent);
 632
 633         sock_hold(sk);
 634         spin_lock_irqsave(&par->accept_q_lock, flags);
 635         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 636         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 637         iucv_sk(sk)->parent = parent;
 638         sk_acceptq_added(parent);
 639 }
 640
 641 void iucv_accept_unlink(struct sock *sk)
 642 {
 643         unsigned long flags;
 644         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 645
 646         spin_lock_irqsave(&par->accept_q_lock, flags);
 647         list_del_init(&iucv_sk(sk)->accept_q);
 648         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 649         sk_acceptq_removed(iucv_sk(sk)->parent);
 650         iucv_sk(sk)->parent = NULL;
 651         sock_put(sk);
 652 }
 653
 654 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 655 {
 656         struct iucv_sock *isk, *n;
 657         struct sock *sk;
 658
 659         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 660                 sk = (struct sock *) isk;
 661                 lock_sock(sk);
 662
 663                 if (sk->sk_state == IUCV_CLOSED) {
 664                         iucv_accept_unlink(sk);
 665                         release_sock(sk);
 666                         continue;
 667                 }
 668
 669                 if (sk->sk_state == IUCV_CONNECTED ||
 670                     sk->sk_state == IUCV_DISCONN ||
 671                     !newsock) {
 672                         iucv_accept_unlink(sk);
 673                         if (newsock)
 674                                 sock_graft(sk, newsock);
 675
 676                         release_sock(sk);
 677                         return sk;
 678                 }
 679
 680                 release_sock(sk);
 681         }
 682         return NULL;
 683 }
 684
 685 static void __iucv_auto_name(struct iucv_sock *iucv)
 686 {
 687         char name[12];
 688
 689         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 690         while (__iucv_get_sock_by_name(name)) {
 691                 sprintf(name, "%08x",
 692                         atomic_inc_return(&iucv_sk_list.autobind_name));
 693         }
 694         memcpy(iucv->src_name, name, 8);
 695 }
 696
 697 /* Bind an unbound socket */
 698 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 699                           int addr_len)
 700 {
 701         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 702         struct sock *sk = sock->sk;
 703         struct iucv_sock *iucv;
 704         int err = 0;
 705         struct net_device *dev;
 706         char uid[9];
 707
 708         /* Verify the input sockaddr */
 709         if (!addr || addr->sa_family != AF_IUCV)
 710                 return -EINVAL;
 711
 712         lock_sock(sk);
 713         if (sk->sk_state != IUCV_OPEN) {
 714                 err = -EBADFD;
 715                 goto done;
 716         }
 717
 718         write_lock_bh(&iucv_sk_list.lock);
 719
 720         iucv = iucv_sk(sk);
 721         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 722                 err = -EADDRINUSE;
 723                 goto done_unlock;
 724         }
 725         if (iucv->path)
 726                 goto done_unlock;
 727
 728         /* Bind the socket */
 729         if (pr_iucv)
 730                 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
 731                         goto vm_bind; /* VM IUCV transport */
 732
 733         /* try hiper transport */
 734         memcpy(uid, sa->siucv_user_id, sizeof(uid));
 735         ASCEBC(uid, 8);
 736         rcu_read_lock();
 737         for_each_netdev_rcu(&init_net, dev) {
 738                 if (!memcmp(dev->perm_addr, uid, 8)) {
 739                         memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
 740                         /* Check for unitialized siucv_name */
 741                         if (strncmp(sa->siucv_name, "        ", 8) == 0)
 742                                 __iucv_auto_name(iucv);
 743                         else
 744                                 memcpy(iucv->src_name, sa->siucv_name, 8);
 745                         sk->sk_bound_dev_if = dev->ifindex;
 746                         iucv->hs_dev = dev;
 747                         dev_hold(dev);
 748                         sk->sk_state = IUCV_BOUND;
 749                         iucv->transport = AF_IUCV_TRANS_HIPER;
 750                         if (!iucv->msglimit)
 751                                 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
 752                         rcu_read_unlock();
 753                         goto done_unlock;
 754                 }
 755         }
 756         rcu_read_unlock();
 757 vm_bind:
 758         if (pr_iucv) {
 759                 /* use local userid for backward compat */
 760                 memcpy(iucv->src_name, sa->siucv_name, 8);
 761                 memcpy(iucv->src_user_id, iucv_userid, 8);
 762                 sk->sk_state = IUCV_BOUND;
 763                 iucv->transport = AF_IUCV_TRANS_IUCV;
 764                 if (!iucv->msglimit)
 765                         iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 766                 goto done_unlock;
 767         }
 768         /* found no dev to bind */
 769         err = -ENODEV;
 770 done_unlock:
 771         /* Release the socket list lock */
 772         write_unlock_bh(&iucv_sk_list.lock);
 773 done:
 774         release_sock(sk);
 775         return err;
 776 }
 777
 778 /* Automatically bind an unbound socket */
 779 static int iucv_sock_autobind(struct sock *sk)
 780 {
 781         struct iucv_sock *iucv = iucv_sk(sk);
 782         int err = 0;
 783
 784         if (unlikely(!pr_iucv))
 785                 return -EPROTO;
 786
 787         memcpy(iucv->src_user_id, iucv_userid, 8);
 788
 789         write_lock_bh(&iucv_sk_list.lock);
 790         __iucv_auto_name(iucv);
 791         write_unlock_bh(&iucv_sk_list.lock);
 792
 793         if (!iucv->msglimit)
 794                 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 795
 796         return err;
 797 }
 798
 799 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
 800 {
 801         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 802         struct sock *sk = sock->sk;
 803         struct iucv_sock *iucv = iucv_sk(sk);
 804         unsigned char user_data[16];
 805         int err;
 806
 807         high_nmcpy(user_data, sa->siucv_name);
 808         low_nmcpy(user_data, iucv->src_name);
 809         ASCEBC(user_data, sizeof(user_data));
 810
 811         /* Create path. */
 812         iucv->path = iucv_path_alloc(iucv->msglimit,
 813                                      IUCV_IPRMDATA, GFP_KERNEL);
 814         if (!iucv->path) {
 815                 err = -ENOMEM;
 816                 goto done;
 817         }
 818         err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
 819                                     sa->siucv_user_id, NULL, user_data,
 820                                     sk);
 821         if (err) {
 822                 iucv_path_free(iucv->path);
 823                 iucv->path = NULL;
 824                 switch (err) {
 825                 case 0x0b:      /* Target communicator is not logged on */
 826                         err = -ENETUNREACH;
 827                         break;
 828                 case 0x0d:      /* Max connections for this guest exceeded */
 829                 case 0x0e:      /* Max connections for target guest exceeded */
 830                         err = -EAGAIN;
 831                         break;
 832                 case 0x0f:      /* Missing IUCV authorization */
 833                         err = -EACCES;
 834                         break;
 835                 default:
 836                         err = -ECONNREFUSED;
 837                         break;
 838                 }
 839         }
 840 done:
 841         return err;
 842 }
 843
 844 /* Connect an unconnected socket */
 845 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 846                              int alen, int flags)
 847 {
 848         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 849         struct sock *sk = sock->sk;
 850         struct iucv_sock *iucv = iucv_sk(sk);
 851         int err;
 852
 853         if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
 854                 return -EINVAL;
 855
 856         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 857                 return -EBADFD;
 858
 859         if (sk->sk_state == IUCV_OPEN &&
 860             iucv->transport == AF_IUCV_TRANS_HIPER)
 861                 return -EBADFD; /* explicit bind required */
 862
 863         if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
 864                 return -EINVAL;
 865
 866         if (sk->sk_state == IUCV_OPEN) {
 867                 err = iucv_sock_autobind(sk);
 868                 if (unlikely(err))
 869                         return err;
 870         }
 871
 872         lock_sock(sk);
 873
 874         /* Set the destination information */
 875         memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
 876         memcpy(iucv->dst_name, sa->siucv_name, 8);
 877
 878         if (iucv->transport == AF_IUCV_TRANS_HIPER)
 879                 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
 880         else
 881                 err = afiucv_path_connect(sock, addr);
 882         if (err)
 883                 goto done;
 884
 885         if (sk->sk_state != IUCV_CONNECTED)
 886                 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
 887                                                             IUCV_DISCONN),
 888                                      sock_sndtimeo(sk, flags & O_NONBLOCK));
 889
 890         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
 891                 err = -ECONNREFUSED;
 892
 893         if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
 894                 iucv_sever_path(sk, 0);
 895
 896 done:
 897         release_sock(sk);
 898         return err;
 899 }
 900
 901 /* Move a socket into listening state. */
 902 static int iucv_sock_listen(struct socket *sock, int backlog)
 903 {
 904         struct sock *sk = sock->sk;
 905         int err;
 906
 907         lock_sock(sk);
 908
 909         err = -EINVAL;
 910         if (sk->sk_state != IUCV_BOUND)
 911                 goto done;
 912
 913         if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
 914                 goto done;
 915
 916         sk->sk_max_ack_backlog = backlog;
 917         sk->sk_ack_backlog = 0;
 918         sk->sk_state = IUCV_LISTEN;
 919         err = 0;
 920
 921 done:
 922         release_sock(sk);
 923         return err;
 924 }
 925
 926 /* Accept a pending connection */
 927 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 928                             int flags)
 929 {
 930         DECLARE_WAITQUEUE(wait, current);
 931         struct sock *sk = sock->sk, *nsk;
 932         long timeo;
 933         int err = 0;
 934
 935         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 936
 937         if (sk->sk_state != IUCV_LISTEN) {
 938                 err = -EBADFD;
 939                 goto done;
 940         }
 941
 942         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 943
 944         /* Wait for an incoming connection */
 945         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 946         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 947                 set_current_state(TASK_INTERRUPTIBLE);
 948                 if (!timeo) {
 949                         err = -EAGAIN;
 950                         break;
 951                 }
 952
 953                 release_sock(sk);
 954                 timeo = schedule_timeout(timeo);
 955                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 956
 957                 if (sk->sk_state != IUCV_LISTEN) {
 958                         err = -EBADFD;
 959                         break;
 960                 }
 961
 962                 if (signal_pending(current)) {
 963                         err = sock_intr_errno(timeo);
 964                         break;
 965                 }
 966         }
 967
 968         set_current_state(TASK_RUNNING);
 969         remove_wait_queue(sk_sleep(sk), &wait);
 970
 971         if (err)
 972                 goto done;
 973
 974         newsock->state = SS_CONNECTED;
 975
 976 done:
 977         release_sock(sk);
 978         return err;
 979 }
 980
 981 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 982                              int *len, int peer)
 983 {
 984         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 985         struct sock *sk = sock->sk;
 986         struct iucv_sock *iucv = iucv_sk(sk);
 987
 988         addr->sa_family = AF_IUCV;
 989         *len = sizeof(struct sockaddr_iucv);
 990
 991         if (peer) {
 992                 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
 993                 memcpy(siucv->siucv_name, iucv->dst_name, 8);
 994         } else {
 995                 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
 996                 memcpy(siucv->siucv_name, iucv->src_name, 8);
 997         }
 998         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
 999         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1000         memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1001
1002         return 0;
1003 }
1004
1005 /**
1006  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1007  * @path:       IUCV path
1008  * @msg:        Pointer to a struct iucv_message
1009  * @skb:        The socket data to send, skb->len MUST BE <= 7
1010  *
1011  * Send the socket data in the parameter list in the iucv message
1012  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1013  * list and the socket data len at index 7 (last byte).
1014  * See also iucv_msg_length().
1015  *
1016  * Returns the error code from the iucv_message_send() call.
1017  */
1018 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1019                           struct sk_buff *skb)
1020 {
1021         u8 prmdata[8];
1022
1023         memcpy(prmdata, (void *) skb->data, skb->len);
1024         prmdata[7] = 0xff - (u8) skb->len;
1025         return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1026                                  (void *) prmdata, 8);
1027 }
1028
1029 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
1030                              struct msghdr *msg, size_t len)
1031 {
1032         struct sock *sk = sock->sk;
1033         struct iucv_sock *iucv = iucv_sk(sk);
1034         struct sk_buff *skb;
1035         struct iucv_message txmsg;
1036         struct cmsghdr *cmsg;
1037         int cmsg_done;
1038         long timeo;
1039         char user_id[9];
1040         char appl_id[9];
1041         int err;
1042         int noblock = msg->msg_flags & MSG_DONTWAIT;
1043
1044         err = sock_error(sk);
1045         if (err)
1046                 return err;
1047
1048         if (msg->msg_flags & MSG_OOB)
1049                 return -EOPNOTSUPP;
1050
1051         /* SOCK_SEQPACKET: we do not support segmented records */
1052         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1053                 return -EOPNOTSUPP;
1054
1055         lock_sock(sk);
1056
1057         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1058                 err = -EPIPE;
1059                 goto out;
1060         }
1061
1062         /* Return if the socket is not in connected state */
1063         if (sk->sk_state != IUCV_CONNECTED) {
1064                 err = -ENOTCONN;
1065                 goto out;
1066         }
1067
1068         /* initialize defaults */
1069         cmsg_done   = 0;        /* check for duplicate headers */
1070         txmsg.class = 0;
1071
1072         /* iterate over control messages */
1073         for_each_cmsghdr(cmsg, msg) {
1074                 if (!CMSG_OK(msg, cmsg)) {
1075                         err = -EINVAL;
1076                         goto out;
1077                 }
1078
1079                 if (cmsg->cmsg_level != SOL_IUCV)
1080                         continue;
1081
1082                 if (cmsg->cmsg_type & cmsg_done) {
1083                         err = -EINVAL;
1084                         goto out;
1085                 }
1086                 cmsg_done |= cmsg->cmsg_type;
1087
1088                 switch (cmsg->cmsg_type) {
1089                 case SCM_IUCV_TRGCLS:
1090                         if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1091                                 err = -EINVAL;
1092                                 goto out;
1093                         }
1094
1095                         /* set iucv message target class */
1096                         memcpy(&txmsg.class,
1097                                 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1098
1099                         break;
1100
1101                 default:
1102                         err = -EINVAL;
1103                         goto out;
1104                 }
1105         }
1106
1107         /* allocate one skb for each iucv message:
1108          * this is fine for SOCK_SEQPACKET (unless we want to support
1109          * segmented records using the MSG_EOR flag), but
1110          * for SOCK_STREAM we might want to improve it in future */
1111         if (iucv->transport == AF_IUCV_TRANS_HIPER)
1112                 skb = sock_alloc_send_skb(sk,
1113                         len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1114                         noblock, &err);
1115         else
1116                 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1117         if (!skb) {
1118                 err = -ENOMEM;
1119                 goto out;
1120         }
1121         if (iucv->transport == AF_IUCV_TRANS_HIPER)
1122                 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1123         if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1124                 err = -EFAULT;
1125                 goto fail;
1126         }
1127
1128         /* wait if outstanding messages for iucv path has reached */
1129         timeo = sock_sndtimeo(sk, noblock);
1130         err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1131         if (err)
1132                 goto fail;
1133
1134         /* return -ECONNRESET if the socket is no longer connected */
1135         if (sk->sk_state != IUCV_CONNECTED) {
1136                 err = -ECONNRESET;
1137                 goto fail;
1138         }
1139
1140         /* increment and save iucv message tag for msg_completion cbk */
1141         txmsg.tag = iucv->send_tag++;
1142         IUCV_SKB_CB(skb)->tag = txmsg.tag;
1143
1144         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1145                 atomic_inc(&iucv->msg_sent);
1146                 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1147                 if (err) {
1148                         atomic_dec(&iucv->msg_sent);
1149                         goto fail;
1150                 }
1151                 goto release;
1152         }
1153         skb_queue_tail(&iucv->send_skb_q, skb);
1154
1155         if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1156               && skb->len <= 7) {
1157                 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1158
1159                 /* on success: there is no message_complete callback
1160                  * for an IPRMDATA msg; remove skb from send queue */
1161                 if (err == 0) {
1162                         skb_unlink(skb, &iucv->send_skb_q);
1163                         kfree_skb(skb);
1164                 }
1165
1166                 /* this error should never happen since the
1167                  * IUCV_IPRMDATA path flag is set... sever path */
1168                 if (err == 0x15) {
1169                         pr_iucv->path_sever(iucv->path, NULL);
1170                         skb_unlink(skb, &iucv->send_skb_q);
1171                         err = -EPIPE;
1172                         goto fail;
1173                 }
1174         } else
1175                 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1176                                         (void *) skb->data, skb->len);
1177         if (err) {
1178                 if (err == 3) {
1179                         user_id[8] = 0;
1180                         memcpy(user_id, iucv->dst_user_id, 8);
1181                         appl_id[8] = 0;
1182                         memcpy(appl_id, iucv->dst_name, 8);
1183                         pr_err("Application %s on z/VM guest %s"
1184                                 " exceeds message limit\n",
1185                                 appl_id, user_id);
1186                         err = -EAGAIN;
1187                 } else
1188                         err = -EPIPE;
1189                 skb_unlink(skb, &iucv->send_skb_q);
1190                 goto fail;
1191         }
1192
1193 release:
1194         release_sock(sk);
1195         return len;
1196
1197 fail:
1198         kfree_skb(skb);
1199 out:
1200         release_sock(sk);
1201         return err;
1202 }
1203
1204 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1205  *
1206  * Locking: must be called with message_q.lock held
1207  */
1208 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1209 {
1210         int dataleft, size, copied = 0;
1211         struct sk_buff *nskb;
1212
1213         dataleft = len;
1214         while (dataleft) {
1215                 if (dataleft >= sk->sk_rcvbuf / 4)
1216                         size = sk->sk_rcvbuf / 4;
1217                 else
1218                         size = dataleft;
1219
1220                 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1221                 if (!nskb)
1222                         return -ENOMEM;
1223
1224                 /* copy target class to control buffer of new skb */
1225                 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
1226
1227                 /* copy data fragment */
1228                 memcpy(nskb->data, skb->data + copied, size);
1229                 copied += size;
1230                 dataleft -= size;
1231
1232                 skb_reset_transport_header(nskb);
1233                 skb_reset_network_header(nskb);
1234                 nskb->len = size;
1235
1236                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1237         }
1238
1239         return 0;
1240 }
1241
1242 /* iucv_process_message() - Receive a single outstanding IUCV message
1243  *
1244  * Locking: must be called with message_q.lock held
1245  */
1246 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1247                                  struct iucv_path *path,
1248                                  struct iucv_message *msg)
1249 {
1250         int rc;
1251         unsigned int len;
1252
1253         len = iucv_msg_length(msg);
1254
1255         /* store msg target class in the second 4 bytes of skb ctrl buffer */
1256         /* Note: the first 4 bytes are reserved for msg tag */
1257         IUCV_SKB_CB(skb)->class = msg->class;
1258
1259         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1260         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1261                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1262                         skb->data = NULL;
1263                         skb->len = 0;
1264                 }
1265         } else {
1266                 rc = pr_iucv->message_receive(path, msg,
1267                                               msg->flags & IUCV_IPRMDATA,
1268                                               skb->data, len, NULL);
1269                 if (rc) {
1270                         kfree_skb(skb);
1271                         return;
1272                 }
1273                 /* we need to fragment iucv messages for SOCK_STREAM only;
1274                  * for SOCK_SEQPACKET, it is only relevant if we support
1275                  * record segmentation using MSG_EOR (see also recvmsg()) */
1276                 if (sk->sk_type == SOCK_STREAM &&
1277                     skb->truesize >= sk->sk_rcvbuf / 4) {
1278                         rc = iucv_fragment_skb(sk, skb, len);
1279                         kfree_skb(skb);
1280                         skb = NULL;
1281                         if (rc) {
1282                                 pr_iucv->path_sever(path, NULL);
1283                                 return;
1284                         }
1285                         skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1286                 } else {
1287                         skb_reset_transport_header(skb);
1288                         skb_reset_network_header(skb);
1289                         skb->len = len;
1290                 }
1291         }
1292
1293         IUCV_SKB_CB(skb)->offset = 0;
1294         if (sock_queue_rcv_skb(sk, skb))
1295                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1296 }
1297
1298 /* iucv_process_message_q() - Process outstanding IUCV messages
1299  *
1300  * Locking: must be called with message_q.lock held
1301  */
1302 static void iucv_process_message_q(struct sock *sk)
1303 {
1304         struct iucv_sock *iucv = iucv_sk(sk);
1305         struct sk_buff *skb;
1306         struct sock_msg_q *p, *n;
1307
1308         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1309                 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1310                 if (!skb)
1311                         break;
1312                 iucv_process_message(sk, skb, p->path, &p->msg);
1313                 list_del(&p->list);
1314                 kfree(p);
1315                 if (!skb_queue_empty(&iucv->backlog_skb_q))
1316                         break;
1317         }
1318 }
1319
1320 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1321                              struct msghdr *msg, size_t len, int flags)
1322 {
1323         int noblock = flags & MSG_DONTWAIT;
1324         struct sock *sk = sock->sk;
1325         struct iucv_sock *iucv = iucv_sk(sk);
1326         unsigned int copied, rlen;
1327         struct sk_buff *skb, *rskb, *cskb;
1328         int err = 0;
1329         u32 offset;
1330
1331         if ((sk->sk_state == IUCV_DISCONN) &&
1332             skb_queue_empty(&iucv->backlog_skb_q) &&
1333             skb_queue_empty(&sk->sk_receive_queue) &&
1334             list_empty(&iucv->message_q.list))
1335                 return 0;
1336
1337         if (flags & (MSG_OOB))
1338                 return -EOPNOTSUPP;
1339
1340         /* receive/dequeue next skb:
1341          * the function understands MSG_PEEK and, thus, does not dequeue skb */
1342         skb = skb_recv_datagram(sk, flags, noblock, &err);
1343         if (!skb) {
1344                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1345                         return 0;
1346                 return err;
1347         }
1348
1349         offset = IUCV_SKB_CB(skb)->offset;
1350         rlen   = skb->len - offset;             /* real length of skb */
1351         copied = min_t(unsigned int, rlen, len);
1352         if (!rlen)
1353                 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1354
1355         cskb = skb;
1356         if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1357                 if (!(flags & MSG_PEEK))
1358                         skb_queue_head(&sk->sk_receive_queue, skb);
1359                 return -EFAULT;
1360         }
1361
1362         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1363         if (sk->sk_type == SOCK_SEQPACKET) {
1364                 if (copied < rlen)
1365                         msg->msg_flags |= MSG_TRUNC;
1366                 /* each iucv message contains a complete record */
1367                 msg->msg_flags |= MSG_EOR;
1368         }
1369
1370         /* create control message to store iucv msg target class:
1371          * get the trgcls from the control buffer of the skb due to
1372          * fragmentation of original iucv message. */
1373         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1374                        sizeof(IUCV_SKB_CB(skb)->class),
1375                        (void *)&IUCV_SKB_CB(skb)->class);
1376         if (err) {
1377                 if (!(flags & MSG_PEEK))
1378                         skb_queue_head(&sk->sk_receive_queue, skb);
1379                 return err;
1380         }
1381
1382         /* Mark read part of skb as used */
1383         if (!(flags & MSG_PEEK)) {
1384
1385                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1386                 if (sk->sk_type == SOCK_STREAM) {
1387                         if (copied < rlen) {
1388                                 IUCV_SKB_CB(skb)->offset = offset + copied;
1389                                 skb_queue_head(&sk->sk_receive_queue, skb);
1390                                 goto done;
1391                         }
1392                 }
1393
1394                 kfree_skb(skb);
1395                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1396                         atomic_inc(&iucv->msg_recv);
1397                         if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1398                                 WARN_ON(1);
1399                                 iucv_sock_close(sk);
1400                                 return -EFAULT;
1401                         }
1402                 }
1403
1404                 /* Queue backlog skbs */
1405                 spin_lock_bh(&iucv->message_q.lock);
1406                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1407                 while (rskb) {
1408                         IUCV_SKB_CB(rskb)->offset = 0;
1409                         if (sock_queue_rcv_skb(sk, rskb)) {
1410                                 skb_queue_head(&iucv->backlog_skb_q,
1411                                                 rskb);
1412                                 break;
1413                         } else {
1414                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1415                         }
1416                 }
1417                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1418                         if (!list_empty(&iucv->message_q.list))
1419                                 iucv_process_message_q(sk);
1420                         if (atomic_read(&iucv->msg_recv) >=
1421                                                         iucv->msglimit / 2) {
1422                                 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1423                                 if (err) {
1424                                         sk->sk_state = IUCV_DISCONN;
1425                                         sk->sk_state_change(sk);
1426                                 }
1427                         }
1428                 }
1429                 spin_unlock_bh(&iucv->message_q.lock);
1430         }
1431
1432 done:
1433         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1434         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1435                 copied = rlen;
1436
1437         return copied;
1438 }
1439
1440 static inline unsigned int iucv_accept_poll(struct sock *parent)
1441 {
1442         struct iucv_sock *isk, *n;
1443         struct sock *sk;
1444
1445         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1446                 sk = (struct sock *) isk;
1447
1448                 if (sk->sk_state == IUCV_CONNECTED)
1449                         return POLLIN | POLLRDNORM;
1450         }
1451
1452         return 0;
1453 }
1454
1455 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1456                             poll_table *wait)
1457 {
1458         struct sock *sk = sock->sk;
1459         unsigned int mask = 0;
1460
1461         sock_poll_wait(file, sk_sleep(sk), wait);
1462
1463         if (sk->sk_state == IUCV_LISTEN)
1464                 return iucv_accept_poll(sk);
1465
1466         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1467                 mask |= POLLERR |
1468                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1469
1470         if (sk->sk_shutdown & RCV_SHUTDOWN)
1471                 mask |= POLLRDHUP;
1472
1473         if (sk->sk_shutdown == SHUTDOWN_MASK)
1474                 mask |= POLLHUP;
1475
1476         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1477             (sk->sk_shutdown & RCV_SHUTDOWN))
1478                 mask |= POLLIN | POLLRDNORM;
1479
1480         if (sk->sk_state == IUCV_CLOSED)
1481                 mask |= POLLHUP;
1482
1483         if (sk->sk_state == IUCV_DISCONN)
1484                 mask |= POLLIN;
1485
1486         if (sock_writeable(sk) && iucv_below_msglim(sk))
1487                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1488         else
1489                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1490
1491         return mask;
1492 }
1493
1494 static int iucv_sock_shutdown(struct socket *sock, int how)
1495 {
1496         struct sock *sk = sock->sk;
1497         struct iucv_sock *iucv = iucv_sk(sk);
1498         struct iucv_message txmsg;
1499         int err = 0;
1500
1501         how++;
1502
1503         if ((how & ~SHUTDOWN_MASK) || !how)
1504                 return -EINVAL;
1505
1506         lock_sock(sk);
1507         switch (sk->sk_state) {
1508         case IUCV_LISTEN:
1509         case IUCV_DISCONN:
1510         case IUCV_CLOSING:
1511         case IUCV_CLOSED:
1512                 err = -ENOTCONN;
1513                 goto fail;
1514         default:
1515                 break;
1516         }
1517
1518         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1519                 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1520                         txmsg.class = 0;
1521                         txmsg.tag = 0;
1522                         err = pr_iucv->message_send(iucv->path, &txmsg,
1523                                 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1524                         if (err) {
1525                                 switch (err) {
1526                                 case 1:
1527                                         err = -ENOTCONN;
1528                                         break;
1529                                 case 2:
1530                                         err = -ECONNRESET;
1531                                         break;
1532                                 default:
1533                                         err = -ENOTCONN;
1534                                         break;
1535                                 }
1536                         }
1537                 } else
1538                         iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1539         }
1540
1541         sk->sk_shutdown |= how;
1542         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1543                 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1544                     iucv->path) {
1545                         err = pr_iucv->path_quiesce(iucv->path, NULL);
1546                         if (err)
1547                                 err = -ENOTCONN;
1548 /*                      skb_queue_purge(&sk->sk_receive_queue); */
1549                 }
1550                 skb_queue_purge(&sk->sk_receive_queue);
1551         }
1552
1553         /* Wake up anyone sleeping in poll */
1554         sk->sk_state_change(sk);
1555
1556 fail:
1557         release_sock(sk);
1558         return err;
1559 }
1560
1561 static int iucv_sock_release(struct socket *sock)
1562 {
1563         struct sock *sk = sock->sk;
1564         int err = 0;
1565
1566         if (!sk)
1567                 return 0;
1568
1569         iucv_sock_close(sk);
1570
1571         sock_orphan(sk);
1572         iucv_sock_kill(sk);
1573         return err;
1574 }
1575
1576 /* getsockopt and setsockopt */
1577 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1578                                 char __user *optval, unsigned int optlen)
1579 {
1580         struct sock *sk = sock->sk;
1581         struct iucv_sock *iucv = iucv_sk(sk);
1582         int val;
1583         int rc;
1584
1585         if (level != SOL_IUCV)
1586                 return -ENOPROTOOPT;
1587
1588         if (optlen < sizeof(int))
1589                 return -EINVAL;
1590
1591         if (get_user(val, (int __user *) optval))
1592                 return -EFAULT;
1593
1594         rc = 0;
1595
1596         lock_sock(sk);
1597         switch (optname) {
1598         case SO_IPRMDATA_MSG:
1599                 if (val)
1600                         iucv->flags |= IUCV_IPRMDATA;
1601                 else
1602                         iucv->flags &= ~IUCV_IPRMDATA;
1603                 break;
1604         case SO_MSGLIMIT:
1605                 switch (sk->sk_state) {
1606                 case IUCV_OPEN:
1607                 case IUCV_BOUND:
1608                         if (val < 1 || val > (u16)(~0))
1609                                 rc = -EINVAL;
1610                         else
1611                                 iucv->msglimit = val;
1612                         break;
1613                 default:
1614                         rc = -EINVAL;
1615                         break;
1616                 }
1617                 break;
1618         default:
1619                 rc = -ENOPROTOOPT;
1620                 break;
1621         }
1622         release_sock(sk);
1623
1624         return rc;
1625 }
1626
1627 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1628                                 char __user *optval, int __user *optlen)
1629 {
1630         struct sock *sk = sock->sk;
1631         struct iucv_sock *iucv = iucv_sk(sk);
1632         unsigned int val;
1633         int len;
1634
1635         if (level != SOL_IUCV)
1636                 return -ENOPROTOOPT;
1637
1638         if (get_user(len, optlen))
1639                 return -EFAULT;
1640
1641         if (len < 0)
1642                 return -EINVAL;
1643
1644         len = min_t(unsigned int, len, sizeof(int));
1645
1646         switch (optname) {
1647         case SO_IPRMDATA_MSG:
1648                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1649                 break;
1650         case SO_MSGLIMIT:
1651                 lock_sock(sk);
1652                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1653                                            : iucv->msglimit;    /* default */
1654                 release_sock(sk);
1655                 break;
1656         case SO_MSGSIZE:
1657                 if (sk->sk_state == IUCV_OPEN)
1658                         return -EBADFD;
1659                 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1660                                 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1661                                 0x7fffffff;
1662                 break;
1663         default:
1664                 return -ENOPROTOOPT;
1665         }
1666
1667         if (put_user(len, optlen))
1668                 return -EFAULT;
1669         if (copy_to_user(optval, &val, len))
1670                 return -EFAULT;
1671
1672         return 0;
1673 }
1674
1675
1676 /* Callback wrappers - called from iucv base support */
1677 static int iucv_callback_connreq(struct iucv_path *path,
1678                                  u8 ipvmid[8], u8 ipuser[16])
1679 {
1680         unsigned char user_data[16];
1681         unsigned char nuser_data[16];
1682         unsigned char src_name[8];
1683         struct sock *sk, *nsk;
1684         struct iucv_sock *iucv, *niucv;
1685         int err;
1686
1687         memcpy(src_name, ipuser, 8);
1688         EBCASC(src_name, 8);
1689         /* Find out if this path belongs to af_iucv. */
1690         read_lock(&iucv_sk_list.lock);
1691         iucv = NULL;
1692         sk = NULL;
1693         sk_for_each(sk, &iucv_sk_list.head)
1694                 if (sk->sk_state == IUCV_LISTEN &&
1695                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1696                         /*
1697                          * Found a listening socket with
1698                          * src_name == ipuser[0-7].
1699                          */
1700                         iucv = iucv_sk(sk);
1701                         break;
1702                 }
1703         read_unlock(&iucv_sk_list.lock);
1704         if (!iucv)
1705                 /* No socket found, not one of our paths. */
1706                 return -EINVAL;
1707
1708         bh_lock_sock(sk);
1709
1710         /* Check if parent socket is listening */
1711         low_nmcpy(user_data, iucv->src_name);
1712         high_nmcpy(user_data, iucv->dst_name);
1713         ASCEBC(user_data, sizeof(user_data));
1714         if (sk->sk_state != IUCV_LISTEN) {
1715                 err = pr_iucv->path_sever(path, user_data);
1716                 iucv_path_free(path);
1717                 goto fail;
1718         }
1719
1720         /* Check for backlog size */
1721         if (sk_acceptq_is_full(sk)) {
1722                 err = pr_iucv->path_sever(path, user_data);
1723                 iucv_path_free(path);
1724                 goto fail;
1725         }
1726
1727         /* Create the new socket */
1728         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1729         if (!nsk) {
1730                 err = pr_iucv->path_sever(path, user_data);
1731                 iucv_path_free(path);
1732                 goto fail;
1733         }
1734
1735         niucv = iucv_sk(nsk);
1736         iucv_sock_init(nsk, sk);
1737
1738         /* Set the new iucv_sock */
1739         memcpy(niucv->dst_name, ipuser + 8, 8);
1740         EBCASC(niucv->dst_name, 8);
1741         memcpy(niucv->dst_user_id, ipvmid, 8);
1742         memcpy(niucv->src_name, iucv->src_name, 8);
1743         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1744         niucv->path = path;
1745
1746         /* Call iucv_accept */
1747         high_nmcpy(nuser_data, ipuser + 8);
1748         memcpy(nuser_data + 8, niucv->src_name, 8);
1749         ASCEBC(nuser_data + 8, 8);
1750
1751         /* set message limit for path based on msglimit of accepting socket */
1752         niucv->msglimit = iucv->msglimit;
1753         path->msglim = iucv->msglimit;
1754         err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1755         if (err) {
1756                 iucv_sever_path(nsk, 1);
1757                 iucv_sock_kill(nsk);
1758                 goto fail;
1759         }
1760
1761         iucv_accept_enqueue(sk, nsk);
1762
1763         /* Wake up accept */
1764         nsk->sk_state = IUCV_CONNECTED;
1765         sk->sk_data_ready(sk);
1766         err = 0;
1767 fail:
1768         bh_unlock_sock(sk);
1769         return 0;
1770 }
1771
1772 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1773 {
1774         struct sock *sk = path->private;
1775
1776         sk->sk_state = IUCV_CONNECTED;
1777         sk->sk_state_change(sk);
1778 }
1779
1780 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1781 {
1782         struct sock *sk = path->private;
1783         struct iucv_sock *iucv = iucv_sk(sk);
1784         struct sk_buff *skb;
1785         struct sock_msg_q *save_msg;
1786         int len;
1787
1788         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1789                 pr_iucv->message_reject(path, msg);
1790                 return;
1791         }
1792
1793         spin_lock(&iucv->message_q.lock);
1794
1795         if (!list_empty(&iucv->message_q.list) ||
1796             !skb_queue_empty(&iucv->backlog_skb_q))
1797                 goto save_message;
1798
1799         len = atomic_read(&sk->sk_rmem_alloc);
1800         len += SKB_TRUESIZE(iucv_msg_length(msg));
1801         if (len > sk->sk_rcvbuf)
1802                 goto save_message;
1803
1804         skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1805         if (!skb)
1806                 goto save_message;
1807
1808         iucv_process_message(sk, skb, path, msg);
1809         goto out_unlock;
1810
1811 save_message:
1812         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1813         if (!save_msg)
1814                 goto out_unlock;
1815         save_msg->path = path;
1816         save_msg->msg = *msg;
1817
1818         list_add_tail(&save_msg->list, &iucv->message_q.list);
1819
1820 out_unlock:
1821         spin_unlock(&iucv->message_q.lock);
1822 }
1823
1824 static void iucv_callback_txdone(struct iucv_path *path,
1825                                  struct iucv_message *msg)
1826 {
1827         struct sock *sk = path->private;
1828         struct sk_buff *this = NULL;
1829         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1830         struct sk_buff *list_skb = list->next;
1831         unsigned long flags;
1832
1833         bh_lock_sock(sk);
1834         if (!skb_queue_empty(list)) {
1835                 spin_lock_irqsave(&list->lock, flags);
1836
1837                 while (list_skb != (struct sk_buff *)list) {
1838                         if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1839                                 this = list_skb;
1840                                 break;
1841                         }
1842                         list_skb = list_skb->next;
1843                 }
1844                 if (this)
1845                         __skb_unlink(this, list);
1846
1847                 spin_unlock_irqrestore(&list->lock, flags);
1848
1849                 if (this) {
1850                         kfree_skb(this);
1851                         /* wake up any process waiting for sending */
1852                         iucv_sock_wake_msglim(sk);
1853                 }
1854         }
1855
1856         if (sk->sk_state == IUCV_CLOSING) {
1857                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1858                         sk->sk_state = IUCV_CLOSED;
1859                         sk->sk_state_change(sk);
1860                 }
1861         }
1862         bh_unlock_sock(sk);
1863
1864 }
1865
1866 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1867 {
1868         struct sock *sk = path->private;
1869
1870         if (sk->sk_state == IUCV_CLOSED)
1871                 return;
1872
1873         bh_lock_sock(sk);
1874         iucv_sever_path(sk, 1);
1875         sk->sk_state = IUCV_DISCONN;
1876
1877         sk->sk_state_change(sk);
1878         bh_unlock_sock(sk);
1879 }
1880
1881 /* called if the other communication side shuts down its RECV direction;
1882  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1883  */
1884 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1885 {
1886         struct sock *sk = path->private;
1887
1888         bh_lock_sock(sk);
1889         if (sk->sk_state != IUCV_CLOSED) {
1890                 sk->sk_shutdown |= SEND_SHUTDOWN;
1891                 sk->sk_state_change(sk);
1892         }
1893         bh_unlock_sock(sk);
1894 }
1895
1896 /***************** HiperSockets transport callbacks ********************/
1897 static void afiucv_swap_src_dest(struct sk_buff *skb)
1898 {
1899         struct af_iucv_trans_hdr *trans_hdr =
1900                                 (struct af_iucv_trans_hdr *)skb->data;
1901         char tmpID[8];
1902         char tmpName[8];
1903
1904         ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1905         ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1906         ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1907         ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1908         memcpy(tmpID, trans_hdr->srcUserID, 8);
1909         memcpy(tmpName, trans_hdr->srcAppName, 8);
1910         memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1911         memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1912         memcpy(trans_hdr->destUserID, tmpID, 8);
1913         memcpy(trans_hdr->destAppName, tmpName, 8);
1914         skb_push(skb, ETH_HLEN);
1915         memset(skb->data, 0, ETH_HLEN);
1916 }
1917
1918 /**
1919  * afiucv_hs_callback_syn - react on received SYN
1920  **/
1921 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1922 {
1923         struct sock *nsk;
1924         struct iucv_sock *iucv, *niucv;
1925         struct af_iucv_trans_hdr *trans_hdr;
1926         int err;
1927
1928         iucv = iucv_sk(sk);
1929         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1930         if (!iucv) {
1931                 /* no sock - connection refused */
1932                 afiucv_swap_src_dest(skb);
1933                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1934                 err = dev_queue_xmit(skb);
1935                 goto out;
1936         }
1937
1938         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1939         bh_lock_sock(sk);
1940         if ((sk->sk_state != IUCV_LISTEN) ||
1941             sk_acceptq_is_full(sk) ||
1942             !nsk) {
1943                 /* error on server socket - connection refused */
1944                 afiucv_swap_src_dest(skb);
1945                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1946                 err = dev_queue_xmit(skb);
1947                 iucv_sock_kill(nsk);
1948                 bh_unlock_sock(sk);
1949                 goto out;
1950         }
1951
1952         niucv = iucv_sk(nsk);
1953         iucv_sock_init(nsk, sk);
1954         niucv->transport = AF_IUCV_TRANS_HIPER;
1955         niucv->msglimit = iucv->msglimit;
1956         if (!trans_hdr->window)
1957                 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1958         else
1959                 niucv->msglimit_peer = trans_hdr->window;
1960         memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1961         memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1962         memcpy(niucv->src_name, iucv->src_name, 8);
1963         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1964         nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1965         niucv->hs_dev = iucv->hs_dev;
1966         dev_hold(niucv->hs_dev);
1967         afiucv_swap_src_dest(skb);
1968         trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1969         trans_hdr->window = niucv->msglimit;
1970         /* if receiver acks the xmit connection is established */
1971         err = dev_queue_xmit(skb);
1972         if (!err) {
1973                 iucv_accept_enqueue(sk, nsk);
1974                 nsk->sk_state = IUCV_CONNECTED;
1975                 sk->sk_data_ready(sk);
1976         } else
1977                 iucv_sock_kill(nsk);
1978         bh_unlock_sock(sk);
1979
1980 out:
1981         return NET_RX_SUCCESS;
1982 }
1983
1984 /**
1985  * afiucv_hs_callback_synack() - react on received SYN-ACK
1986  **/
1987 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1988 {
1989         struct iucv_sock *iucv = iucv_sk(sk);
1990         struct af_iucv_trans_hdr *trans_hdr =
1991                                         (struct af_iucv_trans_hdr *)skb->data;
1992
1993         if (!iucv)
1994                 goto out;
1995         if (sk->sk_state != IUCV_BOUND)
1996                 goto out;
1997         bh_lock_sock(sk);
1998         iucv->msglimit_peer = trans_hdr->window;
1999         sk->sk_state = IUCV_CONNECTED;
2000         sk->sk_state_change(sk);
2001         bh_unlock_sock(sk);
2002 out:
2003         kfree_skb(skb);
2004         return NET_RX_SUCCESS;
2005 }
2006
2007 /**
2008  * afiucv_hs_callback_synfin() - react on received SYN_FIN
2009  **/
2010 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2011 {
2012         struct iucv_sock *iucv = iucv_sk(sk);
2013
2014         if (!iucv)
2015                 goto out;
2016         if (sk->sk_state != IUCV_BOUND)
2017                 goto out;
2018         bh_lock_sock(sk);
2019         sk->sk_state = IUCV_DISCONN;
2020         sk->sk_state_change(sk);
2021         bh_unlock_sock(sk);
2022 out:
2023         kfree_skb(skb);
2024         return NET_RX_SUCCESS;
2025 }
2026
2027 /**
2028  * afiucv_hs_callback_fin() - react on received FIN
2029  **/
2030 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2031 {
2032         struct iucv_sock *iucv = iucv_sk(sk);
2033
2034         /* other end of connection closed */
2035         if (!iucv)
2036                 goto out;
2037         bh_lock_sock(sk);
2038         if (sk->sk_state == IUCV_CONNECTED) {
2039                 sk->sk_state = IUCV_DISCONN;
2040                 sk->sk_state_change(sk);
2041         }
2042         bh_unlock_sock(sk);
2043 out:
2044         kfree_skb(skb);
2045         return NET_RX_SUCCESS;
2046 }
2047
2048 /**
2049  * afiucv_hs_callback_win() - react on received WIN
2050  **/
2051 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2052 {
2053         struct iucv_sock *iucv = iucv_sk(sk);
2054         struct af_iucv_trans_hdr *trans_hdr =
2055                                         (struct af_iucv_trans_hdr *)skb->data;
2056
2057         if (!iucv)
2058                 return NET_RX_SUCCESS;
2059
2060         if (sk->sk_state != IUCV_CONNECTED)
2061                 return NET_RX_SUCCESS;
2062
2063         atomic_sub(trans_hdr->window, &iucv->msg_sent);
2064         iucv_sock_wake_msglim(sk);
2065         return NET_RX_SUCCESS;
2066 }
2067
2068 /**
2069  * afiucv_hs_callback_rx() - react on received data
2070  **/
2071 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2072 {
2073         struct iucv_sock *iucv = iucv_sk(sk);
2074
2075         if (!iucv) {
2076                 kfree_skb(skb);
2077                 return NET_RX_SUCCESS;
2078         }
2079
2080         if (sk->sk_state != IUCV_CONNECTED) {
2081                 kfree_skb(skb);
2082                 return NET_RX_SUCCESS;
2083         }
2084
2085         if (sk->sk_shutdown & RCV_SHUTDOWN) {
2086                 kfree_skb(skb);
2087                 return NET_RX_SUCCESS;
2088         }
2089
2090                 /* write stuff from iucv_msg to skb cb */
2091         if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
2092                 kfree_skb(skb);
2093                 return NET_RX_SUCCESS;
2094         }
2095         skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2096         skb_reset_transport_header(skb);
2097         skb_reset_network_header(skb);
2098         IUCV_SKB_CB(skb)->offset = 0;
2099         spin_lock(&iucv->message_q.lock);
2100         if (skb_queue_empty(&iucv->backlog_skb_q)) {
2101                 if (sock_queue_rcv_skb(sk, skb)) {
2102                         /* handle rcv queue full */
2103                         skb_queue_tail(&iucv->backlog_skb_q, skb);
2104                 }
2105         } else
2106                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2107         spin_unlock(&iucv->message_q.lock);
2108         return NET_RX_SUCCESS;
2109 }
2110
2111 /**
2112  * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2113  *                   transport
2114  *                   called from netif RX softirq
2115  **/
2116 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2117         struct packet_type *pt, struct net_device *orig_dev)
2118 {
2119         struct sock *sk;
2120         struct iucv_sock *iucv;
2121         struct af_iucv_trans_hdr *trans_hdr;
2122         char nullstring[8];
2123         int err = 0;
2124
2125         skb_pull(skb, ETH_HLEN);
2126         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2127         EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2128         EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2129         EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2130         EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2131         memset(nullstring, 0, sizeof(nullstring));
2132         iucv = NULL;
2133         sk = NULL;
2134         read_lock(&iucv_sk_list.lock);
2135         sk_for_each(sk, &iucv_sk_list.head) {
2136                 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2137                         if ((!memcmp(&iucv_sk(sk)->src_name,
2138                                      trans_hdr->destAppName, 8)) &&
2139                             (!memcmp(&iucv_sk(sk)->src_user_id,
2140                                      trans_hdr->destUserID, 8)) &&
2141                             (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2142                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2143                                      nullstring, 8))) {
2144                                 iucv = iucv_sk(sk);
2145                                 break;
2146                         }
2147                 } else {
2148                         if ((!memcmp(&iucv_sk(sk)->src_name,
2149                                      trans_hdr->destAppName, 8)) &&
2150                             (!memcmp(&iucv_sk(sk)->src_user_id,
2151                                      trans_hdr->destUserID, 8)) &&
2152                             (!memcmp(&iucv_sk(sk)->dst_name,
2153                                      trans_hdr->srcAppName, 8)) &&
2154                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2155                                      trans_hdr->srcUserID, 8))) {
2156                                 iucv = iucv_sk(sk);
2157                                 break;
2158                         }
2159                 }
2160         }
2161         read_unlock(&iucv_sk_list.lock);
2162         if (!iucv)
2163                 sk = NULL;
2164
2165         /* no sock
2166         how should we send with no sock
2167         1) send without sock no send rc checking?
2168         2) introduce default sock to handle this cases
2169
2170          SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2171          data -> send FIN
2172          SYN|ACK, SYN|FIN, FIN -> no action? */
2173
2174         switch (trans_hdr->flags) {
2175         case AF_IUCV_FLAG_SYN:
2176                 /* connect request */
2177                 err = afiucv_hs_callback_syn(sk, skb);
2178                 break;
2179         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2180                 /* connect request confirmed */
2181                 err = afiucv_hs_callback_synack(sk, skb);
2182                 break;
2183         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2184                 /* connect request refused */
2185                 err = afiucv_hs_callback_synfin(sk, skb);
2186                 break;
2187         case (AF_IUCV_FLAG_FIN):
2188                 /* close request */
2189                 err = afiucv_hs_callback_fin(sk, skb);
2190                 break;
2191         case (AF_IUCV_FLAG_WIN):
2192                 err = afiucv_hs_callback_win(sk, skb);
2193                 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2194                         kfree_skb(skb);
2195                         break;
2196                 }
2197                 /* fall through and receive non-zero length data */
2198         case (AF_IUCV_FLAG_SHT):
2199                 /* shutdown request */
2200                 /* fall through and receive zero length data */
2201         case 0:
2202                 /* plain data frame */
2203                 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2204                 err = afiucv_hs_callback_rx(sk, skb);
2205                 break;
2206         default:
2207                 ;
2208         }
2209
2210         return err;
2211 }
2212
2213 /**
2214  * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2215  *                                 transport
2216  **/
2217 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2218                                         enum iucv_tx_notify n)
2219 {
2220         struct sock *isk = skb->sk;
2221         struct sock *sk = NULL;
2222         struct iucv_sock *iucv = NULL;
2223         struct sk_buff_head *list;
2224         struct sk_buff *list_skb;
2225         struct sk_buff *nskb;
2226         unsigned long flags;
2227
2228         read_lock_irqsave(&iucv_sk_list.lock, flags);
2229         sk_for_each(sk, &iucv_sk_list.head)
2230                 if (sk == isk) {
2231                         iucv = iucv_sk(sk);
2232                         break;
2233                 }
2234         read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2235
2236         if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2237                 return;
2238
2239         list = &iucv->send_skb_q;
2240         spin_lock_irqsave(&list->lock, flags);
2241         if (skb_queue_empty(list))
2242                 goto out_unlock;
2243         list_skb = list->next;
2244         nskb = list_skb->next;
2245         while (list_skb != (struct sk_buff *)list) {
2246                 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2247                         switch (n) {
2248                         case TX_NOTIFY_OK:
2249                                 __skb_unlink(list_skb, list);
2250                                 kfree_skb(list_skb);
2251                                 iucv_sock_wake_msglim(sk);
2252                                 break;
2253                         case TX_NOTIFY_PENDING:
2254                                 atomic_inc(&iucv->pendings);
2255                                 break;
2256                         case TX_NOTIFY_DELAYED_OK:
2257                                 __skb_unlink(list_skb, list);
2258                                 atomic_dec(&iucv->pendings);
2259                                 if (atomic_read(&iucv->pendings) <= 0)
2260                                         iucv_sock_wake_msglim(sk);
2261                                 kfree_skb(list_skb);
2262                                 break;
2263                         case TX_NOTIFY_UNREACHABLE:
2264                         case TX_NOTIFY_DELAYED_UNREACHABLE:
2265                         case TX_NOTIFY_TPQFULL: /* not yet used */
2266                         case TX_NOTIFY_GENERALERROR:
2267                         case TX_NOTIFY_DELAYED_GENERALERROR:
2268                                 __skb_unlink(list_skb, list);
2269                                 kfree_skb(list_skb);
2270                                 if (sk->sk_state == IUCV_CONNECTED) {
2271                                         sk->sk_state = IUCV_DISCONN;
2272                                         sk->sk_state_change(sk);
2273                                 }
2274                                 break;
2275                         }
2276                         break;
2277                 }
2278                 list_skb = nskb;
2279                 nskb = nskb->next;
2280         }
2281 out_unlock:
2282         spin_unlock_irqrestore(&list->lock, flags);
2283
2284         if (sk->sk_state == IUCV_CLOSING) {
2285                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2286                         sk->sk_state = IUCV_CLOSED;
2287                         sk->sk_state_change(sk);
2288                 }
2289         }
2290
2291 }
2292
2293 /*
2294  * afiucv_netdev_event: handle netdev notifier chain events
2295  */
2296 static int afiucv_netdev_event(struct notifier_block *this,
2297                                unsigned long event, void *ptr)
2298 {
2299         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2300         struct sock *sk;
2301         struct iucv_sock *iucv;
2302
2303         switch (event) {
2304         case NETDEV_REBOOT:
2305         case NETDEV_GOING_DOWN:
2306                 sk_for_each(sk, &iucv_sk_list.head) {
2307                         iucv = iucv_sk(sk);
2308                         if ((iucv->hs_dev == event_dev) &&
2309                             (sk->sk_state == IUCV_CONNECTED)) {
2310                                 if (event == NETDEV_GOING_DOWN)
2311                                         iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2312                                 sk->sk_state = IUCV_DISCONN;
2313                                 sk->sk_state_change(sk);
2314                         }
2315                 }
2316                 break;
2317         case NETDEV_DOWN:
2318         case NETDEV_UNREGISTER:
2319         default:
2320                 break;
2321         }
2322         return NOTIFY_DONE;
2323 }
2324
2325 static struct notifier_block afiucv_netdev_notifier = {
2326         .notifier_call = afiucv_netdev_event,
2327 };
2328
2329 static const struct proto_ops iucv_sock_ops = {
2330         .family         = PF_IUCV,
2331         .owner          = THIS_MODULE,
2332         .release        = iucv_sock_release,
2333         .bind           = iucv_sock_bind,
2334         .connect        = iucv_sock_connect,
2335         .listen         = iucv_sock_listen,
2336         .accept         = iucv_sock_accept,
2337         .getname        = iucv_sock_getname,
2338         .sendmsg        = iucv_sock_sendmsg,
2339         .recvmsg        = iucv_sock_recvmsg,
2340         .poll           = iucv_sock_poll,
2341         .ioctl          = sock_no_ioctl,
2342         .mmap           = sock_no_mmap,
2343         .socketpair     = sock_no_socketpair,
2344         .shutdown       = iucv_sock_shutdown,
2345         .setsockopt     = iucv_sock_setsockopt,
2346         .getsockopt     = iucv_sock_getsockopt,
2347 };
2348
2349 static const struct net_proto_family iucv_sock_family_ops = {
2350         .family = AF_IUCV,
2351         .owner  = THIS_MODULE,
2352         .create = iucv_sock_create,
2353 };
2354
2355 static struct packet_type iucv_packet_type = {
2356         .type = cpu_to_be16(ETH_P_AF_IUCV),
2357         .func = afiucv_hs_rcv,
2358 };
2359
2360 static int afiucv_iucv_init(void)
2361 {
2362         int err;
2363
2364         err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2365         if (err)
2366                 goto out;
2367         /* establish dummy device */
2368         af_iucv_driver.bus = pr_iucv->bus;
2369         err = driver_register(&af_iucv_driver);
2370         if (err)
2371                 goto out_iucv;
2372         af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2373         if (!af_iucv_dev) {
2374                 err = -ENOMEM;
2375                 goto out_driver;
2376         }
2377         dev_set_name(af_iucv_dev, "af_iucv");
2378         af_iucv_dev->bus = pr_iucv->bus;
2379         af_iucv_dev->parent = pr_iucv->root;
2380         af_iucv_dev->release = (void (*)(struct device *))kfree;
2381         af_iucv_dev->driver = &af_iucv_driver;
2382         err = device_register(af_iucv_dev);
2383         if (err)
2384                 goto out_driver;
2385         return 0;
2386
2387 out_driver:
2388         driver_unregister(&af_iucv_driver);
2389 out_iucv:
2390         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2391 out:
2392         return err;
2393 }
2394
2395 static int __init afiucv_init(void)
2396 {
2397         int err;
2398
2399         if (MACHINE_IS_VM) {
2400                 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2401                 if (unlikely(err)) {
2402                         WARN_ON(err);
2403                         err = -EPROTONOSUPPORT;
2404                         goto out;
2405                 }
2406
2407                 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2408                 if (!pr_iucv) {
2409                         printk(KERN_WARNING "iucv_if lookup failed\n");
2410                         memset(&iucv_userid, 0, sizeof(iucv_userid));
2411                 }
2412         } else {
2413                 memset(&iucv_userid, 0, sizeof(iucv_userid));
2414                 pr_iucv = NULL;
2415         }
2416
2417         err = proto_register(&iucv_proto, 0);
2418         if (err)
2419                 goto out;
2420         err = sock_register(&iucv_sock_family_ops);
2421         if (err)
2422                 goto out_proto;
2423
2424         if (pr_iucv) {
2425                 err = afiucv_iucv_init();
2426                 if (err)
2427                         goto out_sock;
2428         } else
2429                 register_netdevice_notifier(&afiucv_netdev_notifier);
2430         dev_add_pack(&iucv_packet_type);
2431         return 0;
2432
2433 out_sock:
2434         sock_unregister(PF_IUCV);
2435 out_proto:
2436         proto_unregister(&iucv_proto);
2437 out:
2438         if (pr_iucv)
2439                 symbol_put(iucv_if);
2440         return err;
2441 }
2442
2443 static void __exit afiucv_exit(void)
2444 {
2445         if (pr_iucv) {
2446                 device_unregister(af_iucv_dev);
2447                 driver_unregister(&af_iucv_driver);
2448                 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2449                 symbol_put(iucv_if);
2450         } else
2451                 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2452         dev_remove_pack(&iucv_packet_type);
2453         sock_unregister(PF_IUCV);
2454         proto_unregister(&iucv_proto);
2455 }
2456
2457 module_init(afiucv_init);
2458 module_exit(afiucv_exit);
2459
2460 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2461 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2462 MODULE_VERSION(VERSION);
2463 MODULE_LICENSE("GPL");
2464 MODULE_ALIAS_NETPROTO(PF_IUCV);
2465