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 <linux/security.h>
  26 #include <net/sock.h>
  27 #include <asm/ebcdic.h>
  28 #include <asm/cpcmd.h>
  29 #include <linux/kmod.h>
  30
  31 #include <net/iucv/af_iucv.h>
  32
  33 #define VERSION "1.2"
  34
  35 static char iucv_userid[80];
  36
  37 static const struct proto_ops iucv_sock_ops;
  38
  39 static struct proto iucv_proto = {
  40         .name           = "AF_IUCV",
  41         .owner          = THIS_MODULE,
  42         .obj_size       = sizeof(struct iucv_sock),
  43 };
  44
  45 static struct iucv_interface *pr_iucv;
  46
  47 /* special AF_IUCV IPRM messages */
  48 static const u8 iprm_shutdown[8] =
  49         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
  50
  51 #define TRGCLS_SIZE     (sizeof(((struct iucv_message *)0)->class))
  52
  53 #define __iucv_sock_wait(sk, condition, timeo, ret)                     \
  54 do {                                                                    \
  55         DEFINE_WAIT(__wait);                                            \
  56         long __timeo = timeo;                                           \
  57         ret = 0;                                                        \
  58         prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE);     \
  59         while (!(condition)) {                                          \
  60                 if (!__timeo) {                                         \
  61                         ret = -EAGAIN;                                  \
  62                         break;                                          \
  63                 }                                                       \
  64                 if (signal_pending(current)) {                          \
  65                         ret = sock_intr_errno(__timeo);                 \
  66                         break;                                          \
  67                 }                                                       \
  68                 release_sock(sk);                                       \
  69                 __timeo = schedule_timeout(__timeo);                    \
  70                 lock_sock(sk);                                          \
  71                 ret = sock_error(sk);                                   \
  72                 if (ret)                                                \
  73                         break;                                          \
  74         }                                                               \
  75         finish_wait(sk_sleep(sk), &__wait);                             \
  76 } while (0)
  77
  78 #define iucv_sock_wait(sk, condition, timeo)                            \
  79 ({                                                                      \
  80         int __ret = 0;                                                  \
  81         if (!(condition))                                               \
  82                 __iucv_sock_wait(sk, condition, timeo, __ret);          \
  83         __ret;                                                          \
  84 })
  85
  86 static void iucv_sock_kill(struct sock *sk);
  87 static void iucv_sock_close(struct sock *sk);
  88 static void iucv_sever_path(struct sock *, int);
  89
  90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
  91         struct packet_type *pt, struct net_device *orig_dev);
  92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
  93                    struct sk_buff *skb, u8 flags);
  94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
  95
  96 /* Call Back functions */
  97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
  99 static void iucv_callback_connack(struct iucv_path *, u8 *);
 100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
 101 static void iucv_callback_connrej(struct iucv_path *, u8 *);
 102 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
 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 (skwq_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                 security_sk_clone(parent, sk);
 537         }
 538 }
 539
 540 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
 541 {
 542         struct sock *sk;
 543         struct iucv_sock *iucv;
 544
 545         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
 546         if (!sk)
 547                 return NULL;
 548         iucv = iucv_sk(sk);
 549
 550         sock_init_data(sock, sk);
 551         INIT_LIST_HEAD(&iucv->accept_q);
 552         spin_lock_init(&iucv->accept_q_lock);
 553         skb_queue_head_init(&iucv->send_skb_q);
 554         INIT_LIST_HEAD(&iucv->message_q.list);
 555         spin_lock_init(&iucv->message_q.lock);
 556         skb_queue_head_init(&iucv->backlog_skb_q);
 557         iucv->send_tag = 0;
 558         atomic_set(&iucv->pendings, 0);
 559         iucv->flags = 0;
 560         iucv->msglimit = 0;
 561         atomic_set(&iucv->msg_sent, 0);
 562         atomic_set(&iucv->msg_recv, 0);
 563         iucv->path = NULL;
 564         iucv->sk_txnotify = afiucv_hs_callback_txnotify;
 565         memset(&iucv->src_user_id , 0, 32);
 566         if (pr_iucv)
 567                 iucv->transport = AF_IUCV_TRANS_IUCV;
 568         else
 569                 iucv->transport = AF_IUCV_TRANS_HIPER;
 570
 571         sk->sk_destruct = iucv_sock_destruct;
 572         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 573         sk->sk_allocation = GFP_DMA;
 574
 575         sock_reset_flag(sk, SOCK_ZAPPED);
 576
 577         sk->sk_protocol = proto;
 578         sk->sk_state    = IUCV_OPEN;
 579
 580         iucv_sock_link(&iucv_sk_list, sk);
 581         return sk;
 582 }
 583
 584 /* Create an IUCV socket */
 585 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
 586                             int kern)
 587 {
 588         struct sock *sk;
 589
 590         if (protocol && protocol != PF_IUCV)
 591                 return -EPROTONOSUPPORT;
 592
 593         sock->state = SS_UNCONNECTED;
 594
 595         switch (sock->type) {
 596         case SOCK_STREAM:
 597                 sock->ops = &iucv_sock_ops;
 598                 break;
 599         case SOCK_SEQPACKET:
 600                 /* currently, proto ops can handle both sk types */
 601                 sock->ops = &iucv_sock_ops;
 602                 break;
 603         default:
 604                 return -ESOCKTNOSUPPORT;
 605         }
 606
 607         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
 608         if (!sk)
 609                 return -ENOMEM;
 610
 611         iucv_sock_init(sk, NULL);
 612
 613         return 0;
 614 }
 615
 616 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 617 {
 618         write_lock_bh(&l->lock);
 619         sk_add_node(sk, &l->head);
 620         write_unlock_bh(&l->lock);
 621 }
 622
 623 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 624 {
 625         write_lock_bh(&l->lock);
 626         sk_del_node_init(sk);
 627         write_unlock_bh(&l->lock);
 628 }
 629
 630 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 631 {
 632         unsigned long flags;
 633         struct iucv_sock *par = iucv_sk(parent);
 634
 635         sock_hold(sk);
 636         spin_lock_irqsave(&par->accept_q_lock, flags);
 637         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 638         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 639         iucv_sk(sk)->parent = parent;
 640         sk_acceptq_added(parent);
 641 }
 642
 643 void iucv_accept_unlink(struct sock *sk)
 644 {
 645         unsigned long flags;
 646         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 647
 648         spin_lock_irqsave(&par->accept_q_lock, flags);
 649         list_del_init(&iucv_sk(sk)->accept_q);
 650         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 651         sk_acceptq_removed(iucv_sk(sk)->parent);
 652         iucv_sk(sk)->parent = NULL;
 653         sock_put(sk);
 654 }
 655
 656 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 657 {
 658         struct iucv_sock *isk, *n;
 659         struct sock *sk;
 660
 661         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 662                 sk = (struct sock *) isk;
 663                 lock_sock(sk);
 664
 665                 if (sk->sk_state == IUCV_CLOSED) {
 666                         iucv_accept_unlink(sk);
 667                         release_sock(sk);
 668                         continue;
 669                 }
 670
 671                 if (sk->sk_state == IUCV_CONNECTED ||
 672                     sk->sk_state == IUCV_DISCONN ||
 673                     !newsock) {
 674                         iucv_accept_unlink(sk);
 675                         if (newsock)
 676                                 sock_graft(sk, newsock);
 677
 678                         release_sock(sk);
 679                         return sk;
 680                 }
 681
 682                 release_sock(sk);
 683         }
 684         return NULL;
 685 }
 686
 687 static void __iucv_auto_name(struct iucv_sock *iucv)
 688 {
 689         char name[12];
 690
 691         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 692         while (__iucv_get_sock_by_name(name)) {
 693                 sprintf(name, "%08x",
 694                         atomic_inc_return(&iucv_sk_list.autobind_name));
 695         }
 696         memcpy(iucv->src_name, name, 8);
 697 }
 698
 699 /* Bind an unbound socket */
 700 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 701                           int addr_len)
 702 {
 703         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 704         struct sock *sk = sock->sk;
 705         struct iucv_sock *iucv;
 706         int err = 0;
 707         struct net_device *dev;
 708         char uid[9];
 709
 710         /* Verify the input sockaddr */
 711         if (!addr || addr->sa_family != AF_IUCV)
 712                 return -EINVAL;
 713
 714         if (addr_len < sizeof(struct sockaddr_iucv))
 715                 return -EINVAL;
 716
 717         lock_sock(sk);
 718         if (sk->sk_state != IUCV_OPEN) {
 719                 err = -EBADFD;
 720                 goto done;
 721         }
 722
 723         write_lock_bh(&iucv_sk_list.lock);
 724
 725         iucv = iucv_sk(sk);
 726         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 727                 err = -EADDRINUSE;
 728                 goto done_unlock;
 729         }
 730         if (iucv->path)
 731                 goto done_unlock;
 732
 733         /* Bind the socket */
 734         if (pr_iucv)
 735                 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
 736                         goto vm_bind; /* VM IUCV transport */
 737
 738         /* try hiper transport */
 739         memcpy(uid, sa->siucv_user_id, sizeof(uid));
 740         ASCEBC(uid, 8);
 741         rcu_read_lock();
 742         for_each_netdev_rcu(&init_net, dev) {
 743                 if (!memcmp(dev->perm_addr, uid, 8)) {
 744                         memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
 745                         /* Check for unitialized siucv_name */
 746                         if (strncmp(sa->siucv_name, "        ", 8) == 0)
 747                                 __iucv_auto_name(iucv);
 748                         else
 749                                 memcpy(iucv->src_name, sa->siucv_name, 8);
 750                         sk->sk_bound_dev_if = dev->ifindex;
 751                         iucv->hs_dev = dev;
 752                         dev_hold(dev);
 753                         sk->sk_state = IUCV_BOUND;
 754                         iucv->transport = AF_IUCV_TRANS_HIPER;
 755                         if (!iucv->msglimit)
 756                                 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
 757                         rcu_read_unlock();
 758                         goto done_unlock;
 759                 }
 760         }
 761         rcu_read_unlock();
 762 vm_bind:
 763         if (pr_iucv) {
 764                 /* use local userid for backward compat */
 765                 memcpy(iucv->src_name, sa->siucv_name, 8);
 766                 memcpy(iucv->src_user_id, iucv_userid, 8);
 767                 sk->sk_state = IUCV_BOUND;
 768                 iucv->transport = AF_IUCV_TRANS_IUCV;
 769                 if (!iucv->msglimit)
 770                         iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 771                 goto done_unlock;
 772         }
 773         /* found no dev to bind */
 774         err = -ENODEV;
 775 done_unlock:
 776         /* Release the socket list lock */
 777         write_unlock_bh(&iucv_sk_list.lock);
 778 done:
 779         release_sock(sk);
 780         return err;
 781 }
 782
 783 /* Automatically bind an unbound socket */
 784 static int iucv_sock_autobind(struct sock *sk)
 785 {
 786         struct iucv_sock *iucv = iucv_sk(sk);
 787         int err = 0;
 788
 789         if (unlikely(!pr_iucv))
 790                 return -EPROTO;
 791
 792         memcpy(iucv->src_user_id, iucv_userid, 8);
 793
 794         write_lock_bh(&iucv_sk_list.lock);
 795         __iucv_auto_name(iucv);
 796         write_unlock_bh(&iucv_sk_list.lock);
 797
 798         if (!iucv->msglimit)
 799                 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 800
 801         return err;
 802 }
 803
 804 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
 805 {
 806         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 807         struct sock *sk = sock->sk;
 808         struct iucv_sock *iucv = iucv_sk(sk);
 809         unsigned char user_data[16];
 810         int err;
 811
 812         high_nmcpy(user_data, sa->siucv_name);
 813         low_nmcpy(user_data, iucv->src_name);
 814         ASCEBC(user_data, sizeof(user_data));
 815
 816         /* Create path. */
 817         iucv->path = iucv_path_alloc(iucv->msglimit,
 818                                      IUCV_IPRMDATA, GFP_KERNEL);
 819         if (!iucv->path) {
 820                 err = -ENOMEM;
 821                 goto done;
 822         }
 823         err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
 824                                     sa->siucv_user_id, NULL, user_data,
 825                                     sk);
 826         if (err) {
 827                 iucv_path_free(iucv->path);
 828                 iucv->path = NULL;
 829                 switch (err) {
 830                 case 0x0b:      /* Target communicator is not logged on */
 831                         err = -ENETUNREACH;
 832                         break;
 833                 case 0x0d:      /* Max connections for this guest exceeded */
 834                 case 0x0e:      /* Max connections for target guest exceeded */
 835                         err = -EAGAIN;
 836                         break;
 837                 case 0x0f:      /* Missing IUCV authorization */
 838                         err = -EACCES;
 839                         break;
 840                 default:
 841                         err = -ECONNREFUSED;
 842                         break;
 843                 }
 844         }
 845 done:
 846         return err;
 847 }
 848
 849 /* Connect an unconnected socket */
 850 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 851                              int alen, int flags)
 852 {
 853         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 854         struct sock *sk = sock->sk;
 855         struct iucv_sock *iucv = iucv_sk(sk);
 856         int err;
 857
 858         if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
 859                 return -EINVAL;
 860
 861         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 862                 return -EBADFD;
 863
 864         if (sk->sk_state == IUCV_OPEN &&
 865             iucv->transport == AF_IUCV_TRANS_HIPER)
 866                 return -EBADFD; /* explicit bind required */
 867
 868         if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
 869                 return -EINVAL;
 870
 871         if (sk->sk_state == IUCV_OPEN) {
 872                 err = iucv_sock_autobind(sk);
 873                 if (unlikely(err))
 874                         return err;
 875         }
 876
 877         lock_sock(sk);
 878
 879         /* Set the destination information */
 880         memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
 881         memcpy(iucv->dst_name, sa->siucv_name, 8);
 882
 883         if (iucv->transport == AF_IUCV_TRANS_HIPER)
 884                 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
 885         else
 886                 err = afiucv_path_connect(sock, addr);
 887         if (err)
 888                 goto done;
 889
 890         if (sk->sk_state != IUCV_CONNECTED)
 891                 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
 892                                                             IUCV_DISCONN),
 893                                      sock_sndtimeo(sk, flags & O_NONBLOCK));
 894
 895         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
 896                 err = -ECONNREFUSED;
 897
 898         if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
 899                 iucv_sever_path(sk, 0);
 900
 901 done:
 902         release_sock(sk);
 903         return err;
 904 }
 905
 906 /* Move a socket into listening state. */
 907 static int iucv_sock_listen(struct socket *sock, int backlog)
 908 {
 909         struct sock *sk = sock->sk;
 910         int err;
 911
 912         lock_sock(sk);
 913
 914         err = -EINVAL;
 915         if (sk->sk_state != IUCV_BOUND)
 916                 goto done;
 917
 918         if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
 919                 goto done;
 920
 921         sk->sk_max_ack_backlog = backlog;
 922         sk->sk_ack_backlog = 0;
 923         sk->sk_state = IUCV_LISTEN;
 924         err = 0;
 925
 926 done:
 927         release_sock(sk);
 928         return err;
 929 }
 930
 931 /* Accept a pending connection */
 932 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 933                             int flags)
 934 {
 935         DECLARE_WAITQUEUE(wait, current);
 936         struct sock *sk = sock->sk, *nsk;
 937         long timeo;
 938         int err = 0;
 939
 940         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 941
 942         if (sk->sk_state != IUCV_LISTEN) {
 943                 err = -EBADFD;
 944                 goto done;
 945         }
 946
 947         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 948
 949         /* Wait for an incoming connection */
 950         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 951         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 952                 set_current_state(TASK_INTERRUPTIBLE);
 953                 if (!timeo) {
 954                         err = -EAGAIN;
 955                         break;
 956                 }
 957
 958                 release_sock(sk);
 959                 timeo = schedule_timeout(timeo);
 960                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 961
 962                 if (sk->sk_state != IUCV_LISTEN) {
 963                         err = -EBADFD;
 964                         break;
 965                 }
 966
 967                 if (signal_pending(current)) {
 968                         err = sock_intr_errno(timeo);
 969                         break;
 970                 }
 971         }
 972
 973         set_current_state(TASK_RUNNING);
 974         remove_wait_queue(sk_sleep(sk), &wait);
 975
 976         if (err)
 977                 goto done;
 978
 979         newsock->state = SS_CONNECTED;
 980
 981 done:
 982         release_sock(sk);
 983         return err;
 984 }
 985
 986 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 987                              int *len, int peer)
 988 {
 989         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 990         struct sock *sk = sock->sk;
 991         struct iucv_sock *iucv = iucv_sk(sk);
 992
 993         addr->sa_family = AF_IUCV;
 994         *len = sizeof(struct sockaddr_iucv);
 995
 996         if (peer) {
 997                 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
 998                 memcpy(siucv->siucv_name, iucv->dst_name, 8);
 999         } else {
1000                 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1001                 memcpy(siucv->siucv_name, iucv->src_name, 8);
1002         }
1003         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1004         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1005         memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1006
1007         return 0;
1008 }
1009
1010 /**
1011  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1012  * @path:       IUCV path
1013  * @msg:        Pointer to a struct iucv_message
1014  * @skb:        The socket data to send, skb->len MUST BE <= 7
1015  *
1016  * Send the socket data in the parameter list in the iucv message
1017  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1018  * list and the socket data len at index 7 (last byte).
1019  * See also iucv_msg_length().
1020  *
1021  * Returns the error code from the iucv_message_send() call.
1022  */
1023 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1024                           struct sk_buff *skb)
1025 {
1026         u8 prmdata[8];
1027
1028         memcpy(prmdata, (void *) skb->data, skb->len);
1029         prmdata[7] = 0xff - (u8) skb->len;
1030         return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1031                                  (void *) prmdata, 8);
1032 }
1033
1034 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1035                              size_t len)
1036 {
1037         struct sock *sk = sock->sk;
1038         struct iucv_sock *iucv = iucv_sk(sk);
1039         size_t headroom, linear;
1040         struct sk_buff *skb;
1041         struct iucv_message txmsg = {0};
1042         struct cmsghdr *cmsg;
1043         int cmsg_done;
1044         long timeo;
1045         char user_id[9];
1046         char appl_id[9];
1047         int err;
1048         int noblock = msg->msg_flags & MSG_DONTWAIT;
1049
1050         err = sock_error(sk);
1051         if (err)
1052                 return err;
1053
1054         if (msg->msg_flags & MSG_OOB)
1055                 return -EOPNOTSUPP;
1056
1057         /* SOCK_SEQPACKET: we do not support segmented records */
1058         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1059                 return -EOPNOTSUPP;
1060
1061         lock_sock(sk);
1062
1063         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1064                 err = -EPIPE;
1065                 goto out;
1066         }
1067
1068         /* Return if the socket is not in connected state */
1069         if (sk->sk_state != IUCV_CONNECTED) {
1070                 err = -ENOTCONN;
1071                 goto out;
1072         }
1073
1074         /* initialize defaults */
1075         cmsg_done   = 0;        /* check for duplicate headers */
1076         txmsg.class = 0;
1077
1078         /* iterate over control messages */
1079         for_each_cmsghdr(cmsg, msg) {
1080                 if (!CMSG_OK(msg, cmsg)) {
1081                         err = -EINVAL;
1082                         goto out;
1083                 }
1084
1085                 if (cmsg->cmsg_level != SOL_IUCV)
1086                         continue;
1087
1088                 if (cmsg->cmsg_type & cmsg_done) {
1089                         err = -EINVAL;
1090                         goto out;
1091                 }
1092                 cmsg_done |= cmsg->cmsg_type;
1093
1094                 switch (cmsg->cmsg_type) {
1095                 case SCM_IUCV_TRGCLS:
1096                         if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1097                                 err = -EINVAL;
1098                                 goto out;
1099                         }
1100
1101                         /* set iucv message target class */
1102                         memcpy(&txmsg.class,
1103                                 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1104
1105                         break;
1106
1107                 default:
1108                         err = -EINVAL;
1109                         goto out;
1110                 }
1111         }
1112
1113         /* allocate one skb for each iucv message:
1114          * this is fine for SOCK_SEQPACKET (unless we want to support
1115          * segmented records using the MSG_EOR flag), but
1116          * for SOCK_STREAM we might want to improve it in future */
1117         headroom = (iucv->transport == AF_IUCV_TRANS_HIPER)
1118                    ? sizeof(struct af_iucv_trans_hdr) + ETH_HLEN : 0;
1119         if (headroom + len < PAGE_SIZE) {
1120                 linear = len;
1121         } else {
1122                 /* In nonlinear "classic" iucv skb,
1123                  * reserve space for iucv_array
1124                  */
1125                 if (iucv->transport != AF_IUCV_TRANS_HIPER)
1126                         headroom += sizeof(struct iucv_array) *
1127                                     (MAX_SKB_FRAGS + 1);
1128                 linear = PAGE_SIZE - headroom;
1129         }
1130         skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1131                                    noblock, &err, 0);
1132         if (!skb)
1133                 goto out;
1134         if (headroom)
1135                 skb_reserve(skb, headroom);
1136         skb_put(skb, linear);
1137         skb->len = len;
1138         skb->data_len = len - linear;
1139         err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1140         if (err)
1141                 goto fail;
1142
1143         /* wait if outstanding messages for iucv path has reached */
1144         timeo = sock_sndtimeo(sk, noblock);
1145         err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1146         if (err)
1147                 goto fail;
1148
1149         /* return -ECONNRESET if the socket is no longer connected */
1150         if (sk->sk_state != IUCV_CONNECTED) {
1151                 err = -ECONNRESET;
1152                 goto fail;
1153         }
1154
1155         /* increment and save iucv message tag for msg_completion cbk */
1156         txmsg.tag = iucv->send_tag++;
1157         IUCV_SKB_CB(skb)->tag = txmsg.tag;
1158
1159         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1160                 atomic_inc(&iucv->msg_sent);
1161                 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1162                 if (err) {
1163                         atomic_dec(&iucv->msg_sent);
1164                         goto fail;
1165                 }
1166         } else { /* Classic VM IUCV transport */
1167                 skb_queue_tail(&iucv->send_skb_q, skb);
1168
1169                 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1170                     skb->len <= 7) {
1171                         err = iucv_send_iprm(iucv->path, &txmsg, skb);
1172
1173                         /* on success: there is no message_complete callback */
1174                         /* for an IPRMDATA msg; remove skb from send queue   */
1175                         if (err == 0) {
1176                                 skb_unlink(skb, &iucv->send_skb_q);
1177                                 kfree_skb(skb);
1178                         }
1179
1180                         /* this error should never happen since the     */
1181                         /* IUCV_IPRMDATA path flag is set... sever path */
1182                         if (err == 0x15) {
1183                                 pr_iucv->path_sever(iucv->path, NULL);
1184                                 skb_unlink(skb, &iucv->send_skb_q);
1185                                 err = -EPIPE;
1186                                 goto fail;
1187                         }
1188                 } else if (skb_is_nonlinear(skb)) {
1189                         struct iucv_array *iba = (struct iucv_array *)skb->head;
1190                         int i;
1191
1192                         /* skip iucv_array lying in the headroom */
1193                         iba[0].address = (u32)(addr_t)skb->data;
1194                         iba[0].length = (u32)skb_headlen(skb);
1195                         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1196                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1197
1198                                 iba[i + 1].address =
1199                                         (u32)(addr_t)skb_frag_address(frag);
1200                                 iba[i + 1].length = (u32)skb_frag_size(frag);
1201                         }
1202                         err = pr_iucv->message_send(iucv->path, &txmsg,
1203                                                     IUCV_IPBUFLST, 0,
1204                                                     (void *)iba, skb->len);
1205                 } else { /* non-IPRM Linear skb */
1206                         err = pr_iucv->message_send(iucv->path, &txmsg,
1207                                         0, 0, (void *)skb->data, skb->len);
1208                 }
1209                 if (err) {
1210                         if (err == 3) {
1211                                 user_id[8] = 0;
1212                                 memcpy(user_id, iucv->dst_user_id, 8);
1213                                 appl_id[8] = 0;
1214                                 memcpy(appl_id, iucv->dst_name, 8);
1215                                 pr_err(
1216                 "Application %s on z/VM guest %s exceeds message limit\n",
1217                                         appl_id, user_id);
1218                                 err = -EAGAIN;
1219                         } else {
1220                                 err = -EPIPE;
1221                         }
1222                         skb_unlink(skb, &iucv->send_skb_q);
1223                         goto fail;
1224                 }
1225         }
1226
1227         release_sock(sk);
1228         return len;
1229
1230 fail:
1231         kfree_skb(skb);
1232 out:
1233         release_sock(sk);
1234         return err;
1235 }
1236
1237 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1238 {
1239         size_t headroom, linear;
1240         struct sk_buff *skb;
1241         int err;
1242
1243         if (len < PAGE_SIZE) {
1244                 headroom = 0;
1245                 linear = len;
1246         } else {
1247                 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1248                 linear = PAGE_SIZE - headroom;
1249         }
1250         skb = alloc_skb_with_frags(headroom + linear, len - linear,
1251                                    0, &err, GFP_ATOMIC | GFP_DMA);
1252         WARN_ONCE(!skb,
1253                   "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1254                   len, err);
1255         if (skb) {
1256                 if (headroom)
1257                         skb_reserve(skb, headroom);
1258                 skb_put(skb, linear);
1259                 skb->len = len;
1260                 skb->data_len = len - linear;
1261         }
1262         return skb;
1263 }
1264
1265 /* iucv_process_message() - Receive a single outstanding IUCV message
1266  *
1267  * Locking: must be called with message_q.lock held
1268  */
1269 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1270                                  struct iucv_path *path,
1271                                  struct iucv_message *msg)
1272 {
1273         int rc;
1274         unsigned int len;
1275
1276         len = iucv_msg_length(msg);
1277
1278         /* store msg target class in the second 4 bytes of skb ctrl buffer */
1279         /* Note: the first 4 bytes are reserved for msg tag */
1280         IUCV_SKB_CB(skb)->class = msg->class;
1281
1282         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1283         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1284                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1285                         skb->data = NULL;
1286                         skb->len = 0;
1287                 }
1288         } else {
1289                 if (skb_is_nonlinear(skb)) {
1290                         struct iucv_array *iba = (struct iucv_array *)skb->head;
1291                         int i;
1292
1293                         iba[0].address = (u32)(addr_t)skb->data;
1294                         iba[0].length = (u32)skb_headlen(skb);
1295                         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1296                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1297
1298                                 iba[i + 1].address =
1299                                         (u32)(addr_t)skb_frag_address(frag);
1300                                 iba[i + 1].length = (u32)skb_frag_size(frag);
1301                         }
1302                         rc = pr_iucv->message_receive(path, msg,
1303                                               IUCV_IPBUFLST,
1304                                               (void *)iba, len, NULL);
1305                 } else {
1306                         rc = pr_iucv->message_receive(path, msg,
1307                                               msg->flags & IUCV_IPRMDATA,
1308                                               skb->data, len, NULL);
1309                 }
1310                 if (rc) {
1311                         kfree_skb(skb);
1312                         return;
1313                 }
1314                 WARN_ON_ONCE(skb->len != len);
1315         }
1316
1317         IUCV_SKB_CB(skb)->offset = 0;
1318         if (sock_queue_rcv_skb(sk, skb))
1319                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1320 }
1321
1322 /* iucv_process_message_q() - Process outstanding IUCV messages
1323  *
1324  * Locking: must be called with message_q.lock held
1325  */
1326 static void iucv_process_message_q(struct sock *sk)
1327 {
1328         struct iucv_sock *iucv = iucv_sk(sk);
1329         struct sk_buff *skb;
1330         struct sock_msg_q *p, *n;
1331
1332         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1333                 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1334                 if (!skb)
1335                         break;
1336                 iucv_process_message(sk, skb, p->path, &p->msg);
1337                 list_del(&p->list);
1338                 kfree(p);
1339                 if (!skb_queue_empty(&iucv->backlog_skb_q))
1340                         break;
1341         }
1342 }
1343
1344 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1345                              size_t len, int flags)
1346 {
1347         int noblock = flags & MSG_DONTWAIT;
1348         struct sock *sk = sock->sk;
1349         struct iucv_sock *iucv = iucv_sk(sk);
1350         unsigned int copied, rlen;
1351         struct sk_buff *skb, *rskb, *cskb;
1352         int err = 0;
1353         u32 offset;
1354
1355         if ((sk->sk_state == IUCV_DISCONN) &&
1356             skb_queue_empty(&iucv->backlog_skb_q) &&
1357             skb_queue_empty(&sk->sk_receive_queue) &&
1358             list_empty(&iucv->message_q.list))
1359                 return 0;
1360
1361         if (flags & (MSG_OOB))
1362                 return -EOPNOTSUPP;
1363
1364         /* receive/dequeue next skb:
1365          * the function understands MSG_PEEK and, thus, does not dequeue skb */
1366         skb = skb_recv_datagram(sk, flags, noblock, &err);
1367         if (!skb) {
1368                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1369                         return 0;
1370                 return err;
1371         }
1372
1373         offset = IUCV_SKB_CB(skb)->offset;
1374         rlen   = skb->len - offset;             /* real length of skb */
1375         copied = min_t(unsigned int, rlen, len);
1376         if (!rlen)
1377                 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1378
1379         cskb = skb;
1380         if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1381                 if (!(flags & MSG_PEEK))
1382                         skb_queue_head(&sk->sk_receive_queue, skb);
1383                 return -EFAULT;
1384         }
1385
1386         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1387         if (sk->sk_type == SOCK_SEQPACKET) {
1388                 if (copied < rlen)
1389                         msg->msg_flags |= MSG_TRUNC;
1390                 /* each iucv message contains a complete record */
1391                 msg->msg_flags |= MSG_EOR;
1392         }
1393
1394         /* create control message to store iucv msg target class:
1395          * get the trgcls from the control buffer of the skb due to
1396          * fragmentation of original iucv message. */
1397         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1398                        sizeof(IUCV_SKB_CB(skb)->class),
1399                        (void *)&IUCV_SKB_CB(skb)->class);
1400         if (err) {
1401                 if (!(flags & MSG_PEEK))
1402                         skb_queue_head(&sk->sk_receive_queue, skb);
1403                 return err;
1404         }
1405
1406         /* Mark read part of skb as used */
1407         if (!(flags & MSG_PEEK)) {
1408
1409                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1410                 if (sk->sk_type == SOCK_STREAM) {
1411                         if (copied < rlen) {
1412                                 IUCV_SKB_CB(skb)->offset = offset + copied;
1413                                 skb_queue_head(&sk->sk_receive_queue, skb);
1414                                 goto done;
1415                         }
1416                 }
1417
1418                 kfree_skb(skb);
1419                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1420                         atomic_inc(&iucv->msg_recv);
1421                         if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1422                                 WARN_ON(1);
1423                                 iucv_sock_close(sk);
1424                                 return -EFAULT;
1425                         }
1426                 }
1427
1428                 /* Queue backlog skbs */
1429                 spin_lock_bh(&iucv->message_q.lock);
1430                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1431                 while (rskb) {
1432                         IUCV_SKB_CB(rskb)->offset = 0;
1433                         if (sock_queue_rcv_skb(sk, rskb)) {
1434                                 skb_queue_head(&iucv->backlog_skb_q,
1435                                                 rskb);
1436                                 break;
1437                         } else {
1438                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1439                         }
1440                 }
1441                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1442                         if (!list_empty(&iucv->message_q.list))
1443                                 iucv_process_message_q(sk);
1444                         if (atomic_read(&iucv->msg_recv) >=
1445                                                         iucv->msglimit / 2) {
1446                                 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1447                                 if (err) {
1448                                         sk->sk_state = IUCV_DISCONN;
1449                                         sk->sk_state_change(sk);
1450                                 }
1451                         }
1452                 }
1453                 spin_unlock_bh(&iucv->message_q.lock);
1454         }
1455
1456 done:
1457         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1458         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1459                 copied = rlen;
1460
1461         return copied;
1462 }
1463
1464 static inline unsigned int iucv_accept_poll(struct sock *parent)
1465 {
1466         struct iucv_sock *isk, *n;
1467         struct sock *sk;
1468
1469         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1470                 sk = (struct sock *) isk;
1471
1472                 if (sk->sk_state == IUCV_CONNECTED)
1473                         return POLLIN | POLLRDNORM;
1474         }
1475
1476         return 0;
1477 }
1478
1479 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1480                             poll_table *wait)
1481 {
1482         struct sock *sk = sock->sk;
1483         unsigned int mask = 0;
1484
1485         sock_poll_wait(file, sk_sleep(sk), wait);
1486
1487         if (sk->sk_state == IUCV_LISTEN)
1488                 return iucv_accept_poll(sk);
1489
1490         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1491                 mask |= POLLERR |
1492                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1493
1494         if (sk->sk_shutdown & RCV_SHUTDOWN)
1495                 mask |= POLLRDHUP;
1496
1497         if (sk->sk_shutdown == SHUTDOWN_MASK)
1498                 mask |= POLLHUP;
1499
1500         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1501             (sk->sk_shutdown & RCV_SHUTDOWN))
1502                 mask |= POLLIN | POLLRDNORM;
1503
1504         if (sk->sk_state == IUCV_CLOSED)
1505                 mask |= POLLHUP;
1506
1507         if (sk->sk_state == IUCV_DISCONN)
1508                 mask |= POLLIN;
1509
1510         if (sock_writeable(sk) && iucv_below_msglim(sk))
1511                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1512         else
1513                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1514
1515         return mask;
1516 }
1517
1518 static int iucv_sock_shutdown(struct socket *sock, int how)
1519 {
1520         struct sock *sk = sock->sk;
1521         struct iucv_sock *iucv = iucv_sk(sk);
1522         struct iucv_message txmsg;
1523         int err = 0;
1524
1525         how++;
1526
1527         if ((how & ~SHUTDOWN_MASK) || !how)
1528                 return -EINVAL;
1529
1530         lock_sock(sk);
1531         switch (sk->sk_state) {
1532         case IUCV_LISTEN:
1533         case IUCV_DISCONN:
1534         case IUCV_CLOSING:
1535         case IUCV_CLOSED:
1536                 err = -ENOTCONN;
1537                 goto fail;
1538         default:
1539                 break;
1540         }
1541
1542         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1543                 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1544                         txmsg.class = 0;
1545                         txmsg.tag = 0;
1546                         err = pr_iucv->message_send(iucv->path, &txmsg,
1547                                 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1548                         if (err) {
1549                                 switch (err) {
1550                                 case 1:
1551                                         err = -ENOTCONN;
1552                                         break;
1553                                 case 2:
1554                                         err = -ECONNRESET;
1555                                         break;
1556                                 default:
1557                                         err = -ENOTCONN;
1558                                         break;
1559                                 }
1560                         }
1561                 } else
1562                         iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1563         }
1564
1565         sk->sk_shutdown |= how;
1566         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1567                 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1568                     iucv->path) {
1569                         err = pr_iucv->path_quiesce(iucv->path, NULL);
1570                         if (err)
1571                                 err = -ENOTCONN;
1572 /*                      skb_queue_purge(&sk->sk_receive_queue); */
1573                 }
1574                 skb_queue_purge(&sk->sk_receive_queue);
1575         }
1576
1577         /* Wake up anyone sleeping in poll */
1578         sk->sk_state_change(sk);
1579
1580 fail:
1581         release_sock(sk);
1582         return err;
1583 }
1584
1585 static int iucv_sock_release(struct socket *sock)
1586 {
1587         struct sock *sk = sock->sk;
1588         int err = 0;
1589
1590         if (!sk)
1591                 return 0;
1592
1593         iucv_sock_close(sk);
1594
1595         sock_orphan(sk);
1596         iucv_sock_kill(sk);
1597         return err;
1598 }
1599
1600 /* getsockopt and setsockopt */
1601 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1602                                 char __user *optval, unsigned int optlen)
1603 {
1604         struct sock *sk = sock->sk;
1605         struct iucv_sock *iucv = iucv_sk(sk);
1606         int val;
1607         int rc;
1608
1609         if (level != SOL_IUCV)
1610                 return -ENOPROTOOPT;
1611
1612         if (optlen < sizeof(int))
1613                 return -EINVAL;
1614
1615         if (get_user(val, (int __user *) optval))
1616                 return -EFAULT;
1617
1618         rc = 0;
1619
1620         lock_sock(sk);
1621         switch (optname) {
1622         case SO_IPRMDATA_MSG:
1623                 if (val)
1624                         iucv->flags |= IUCV_IPRMDATA;
1625                 else
1626                         iucv->flags &= ~IUCV_IPRMDATA;
1627                 break;
1628         case SO_MSGLIMIT:
1629                 switch (sk->sk_state) {
1630                 case IUCV_OPEN:
1631                 case IUCV_BOUND:
1632                         if (val < 1 || val > (u16)(~0))
1633                                 rc = -EINVAL;
1634                         else
1635                                 iucv->msglimit = val;
1636                         break;
1637                 default:
1638                         rc = -EINVAL;
1639                         break;
1640                 }
1641                 break;
1642         default:
1643                 rc = -ENOPROTOOPT;
1644                 break;
1645         }
1646         release_sock(sk);
1647
1648         return rc;
1649 }
1650
1651 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1652                                 char __user *optval, int __user *optlen)
1653 {
1654         struct sock *sk = sock->sk;
1655         struct iucv_sock *iucv = iucv_sk(sk);
1656         unsigned int val;
1657         int len;
1658
1659         if (level != SOL_IUCV)
1660                 return -ENOPROTOOPT;
1661
1662         if (get_user(len, optlen))
1663                 return -EFAULT;
1664
1665         if (len < 0)
1666                 return -EINVAL;
1667
1668         len = min_t(unsigned int, len, sizeof(int));
1669
1670         switch (optname) {
1671         case SO_IPRMDATA_MSG:
1672                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1673                 break;
1674         case SO_MSGLIMIT:
1675                 lock_sock(sk);
1676                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1677                                            : iucv->msglimit;    /* default */
1678                 release_sock(sk);
1679                 break;
1680         case SO_MSGSIZE:
1681                 if (sk->sk_state == IUCV_OPEN)
1682                         return -EBADFD;
1683                 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1684                                 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1685                                 0x7fffffff;
1686                 break;
1687         default:
1688                 return -ENOPROTOOPT;
1689         }
1690
1691         if (put_user(len, optlen))
1692                 return -EFAULT;
1693         if (copy_to_user(optval, &val, len))
1694                 return -EFAULT;
1695
1696         return 0;
1697 }
1698
1699
1700 /* Callback wrappers - called from iucv base support */
1701 static int iucv_callback_connreq(struct iucv_path *path,
1702                                  u8 ipvmid[8], u8 ipuser[16])
1703 {
1704         unsigned char user_data[16];
1705         unsigned char nuser_data[16];
1706         unsigned char src_name[8];
1707         struct sock *sk, *nsk;
1708         struct iucv_sock *iucv, *niucv;
1709         int err;
1710
1711         memcpy(src_name, ipuser, 8);
1712         EBCASC(src_name, 8);
1713         /* Find out if this path belongs to af_iucv. */
1714         read_lock(&iucv_sk_list.lock);
1715         iucv = NULL;
1716         sk = NULL;
1717         sk_for_each(sk, &iucv_sk_list.head)
1718                 if (sk->sk_state == IUCV_LISTEN &&
1719                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1720                         /*
1721                          * Found a listening socket with
1722                          * src_name == ipuser[0-7].
1723                          */
1724                         iucv = iucv_sk(sk);
1725                         break;
1726                 }
1727         read_unlock(&iucv_sk_list.lock);
1728         if (!iucv)
1729                 /* No socket found, not one of our paths. */
1730                 return -EINVAL;
1731
1732         bh_lock_sock(sk);
1733
1734         /* Check if parent socket is listening */
1735         low_nmcpy(user_data, iucv->src_name);
1736         high_nmcpy(user_data, iucv->dst_name);
1737         ASCEBC(user_data, sizeof(user_data));
1738         if (sk->sk_state != IUCV_LISTEN) {
1739                 err = pr_iucv->path_sever(path, user_data);
1740                 iucv_path_free(path);
1741                 goto fail;
1742         }
1743
1744         /* Check for backlog size */
1745         if (sk_acceptq_is_full(sk)) {
1746                 err = pr_iucv->path_sever(path, user_data);
1747                 iucv_path_free(path);
1748                 goto fail;
1749         }
1750
1751         /* Create the new socket */
1752         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1753         if (!nsk) {
1754                 err = pr_iucv->path_sever(path, user_data);
1755                 iucv_path_free(path);
1756                 goto fail;
1757         }
1758
1759         niucv = iucv_sk(nsk);
1760         iucv_sock_init(nsk, sk);
1761
1762         /* Set the new iucv_sock */
1763         memcpy(niucv->dst_name, ipuser + 8, 8);
1764         EBCASC(niucv->dst_name, 8);
1765         memcpy(niucv->dst_user_id, ipvmid, 8);
1766         memcpy(niucv->src_name, iucv->src_name, 8);
1767         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1768         niucv->path = path;
1769
1770         /* Call iucv_accept */
1771         high_nmcpy(nuser_data, ipuser + 8);
1772         memcpy(nuser_data + 8, niucv->src_name, 8);
1773         ASCEBC(nuser_data + 8, 8);
1774
1775         /* set message limit for path based on msglimit of accepting socket */
1776         niucv->msglimit = iucv->msglimit;
1777         path->msglim = iucv->msglimit;
1778         err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1779         if (err) {
1780                 iucv_sever_path(nsk, 1);
1781                 iucv_sock_kill(nsk);
1782                 goto fail;
1783         }
1784
1785         iucv_accept_enqueue(sk, nsk);
1786
1787         /* Wake up accept */
1788         nsk->sk_state = IUCV_CONNECTED;
1789         sk->sk_data_ready(sk);
1790         err = 0;
1791 fail:
1792         bh_unlock_sock(sk);
1793         return 0;
1794 }
1795
1796 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1797 {
1798         struct sock *sk = path->private;
1799
1800         sk->sk_state = IUCV_CONNECTED;
1801         sk->sk_state_change(sk);
1802 }
1803
1804 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1805 {
1806         struct sock *sk = path->private;
1807         struct iucv_sock *iucv = iucv_sk(sk);
1808         struct sk_buff *skb;
1809         struct sock_msg_q *save_msg;
1810         int len;
1811
1812         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1813                 pr_iucv->message_reject(path, msg);
1814                 return;
1815         }
1816
1817         spin_lock(&iucv->message_q.lock);
1818
1819         if (!list_empty(&iucv->message_q.list) ||
1820             !skb_queue_empty(&iucv->backlog_skb_q))
1821                 goto save_message;
1822
1823         len = atomic_read(&sk->sk_rmem_alloc);
1824         len += SKB_TRUESIZE(iucv_msg_length(msg));
1825         if (len > sk->sk_rcvbuf)
1826                 goto save_message;
1827
1828         skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1829         if (!skb)
1830                 goto save_message;
1831
1832         iucv_process_message(sk, skb, path, msg);
1833         goto out_unlock;
1834
1835 save_message:
1836         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1837         if (!save_msg)
1838                 goto out_unlock;
1839         save_msg->path = path;
1840         save_msg->msg = *msg;
1841
1842         list_add_tail(&save_msg->list, &iucv->message_q.list);
1843
1844 out_unlock:
1845         spin_unlock(&iucv->message_q.lock);
1846 }
1847
1848 static void iucv_callback_txdone(struct iucv_path *path,
1849                                  struct iucv_message *msg)
1850 {
1851         struct sock *sk = path->private;
1852         struct sk_buff *this = NULL;
1853         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1854         struct sk_buff *list_skb = list->next;
1855         unsigned long flags;
1856
1857         bh_lock_sock(sk);
1858         if (!skb_queue_empty(list)) {
1859                 spin_lock_irqsave(&list->lock, flags);
1860
1861                 while (list_skb != (struct sk_buff *)list) {
1862                         if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1863                                 this = list_skb;
1864                                 break;
1865                         }
1866                         list_skb = list_skb->next;
1867                 }
1868                 if (this)
1869                         __skb_unlink(this, list);
1870
1871                 spin_unlock_irqrestore(&list->lock, flags);
1872
1873                 if (this) {
1874                         kfree_skb(this);
1875                         /* wake up any process waiting for sending */
1876                         iucv_sock_wake_msglim(sk);
1877                 }
1878         }
1879
1880         if (sk->sk_state == IUCV_CLOSING) {
1881                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1882                         sk->sk_state = IUCV_CLOSED;
1883                         sk->sk_state_change(sk);
1884                 }
1885         }
1886         bh_unlock_sock(sk);
1887
1888 }
1889
1890 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1891 {
1892         struct sock *sk = path->private;
1893
1894         if (sk->sk_state == IUCV_CLOSED)
1895                 return;
1896
1897         bh_lock_sock(sk);
1898         iucv_sever_path(sk, 1);
1899         sk->sk_state = IUCV_DISCONN;
1900
1901         sk->sk_state_change(sk);
1902         bh_unlock_sock(sk);
1903 }
1904
1905 /* called if the other communication side shuts down its RECV direction;
1906  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1907  */
1908 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1909 {
1910         struct sock *sk = path->private;
1911
1912         bh_lock_sock(sk);
1913         if (sk->sk_state != IUCV_CLOSED) {
1914                 sk->sk_shutdown |= SEND_SHUTDOWN;
1915                 sk->sk_state_change(sk);
1916         }
1917         bh_unlock_sock(sk);
1918 }
1919
1920 /***************** HiperSockets transport callbacks ********************/
1921 static void afiucv_swap_src_dest(struct sk_buff *skb)
1922 {
1923         struct af_iucv_trans_hdr *trans_hdr =
1924                                 (struct af_iucv_trans_hdr *)skb->data;
1925         char tmpID[8];
1926         char tmpName[8];
1927
1928         ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1929         ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1930         ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1931         ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1932         memcpy(tmpID, trans_hdr->srcUserID, 8);
1933         memcpy(tmpName, trans_hdr->srcAppName, 8);
1934         memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1935         memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1936         memcpy(trans_hdr->destUserID, tmpID, 8);
1937         memcpy(trans_hdr->destAppName, tmpName, 8);
1938         skb_push(skb, ETH_HLEN);
1939         memset(skb->data, 0, ETH_HLEN);
1940 }
1941
1942 /**
1943  * afiucv_hs_callback_syn - react on received SYN
1944  **/
1945 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1946 {
1947         struct sock *nsk;
1948         struct iucv_sock *iucv, *niucv;
1949         struct af_iucv_trans_hdr *trans_hdr;
1950         int err;
1951
1952         iucv = iucv_sk(sk);
1953         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1954         if (!iucv) {
1955                 /* no sock - connection refused */
1956                 afiucv_swap_src_dest(skb);
1957                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1958                 err = dev_queue_xmit(skb);
1959                 goto out;
1960         }
1961
1962         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1963         bh_lock_sock(sk);
1964         if ((sk->sk_state != IUCV_LISTEN) ||
1965             sk_acceptq_is_full(sk) ||
1966             !nsk) {
1967                 /* error on server socket - connection refused */
1968                 afiucv_swap_src_dest(skb);
1969                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1970                 err = dev_queue_xmit(skb);
1971                 iucv_sock_kill(nsk);
1972                 bh_unlock_sock(sk);
1973                 goto out;
1974         }
1975
1976         niucv = iucv_sk(nsk);
1977         iucv_sock_init(nsk, sk);
1978         niucv->transport = AF_IUCV_TRANS_HIPER;
1979         niucv->msglimit = iucv->msglimit;
1980         if (!trans_hdr->window)
1981                 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1982         else
1983                 niucv->msglimit_peer = trans_hdr->window;
1984         memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1985         memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1986         memcpy(niucv->src_name, iucv->src_name, 8);
1987         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1988         nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1989         niucv->hs_dev = iucv->hs_dev;
1990         dev_hold(niucv->hs_dev);
1991         afiucv_swap_src_dest(skb);
1992         trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1993         trans_hdr->window = niucv->msglimit;
1994         /* if receiver acks the xmit connection is established */
1995         err = dev_queue_xmit(skb);
1996         if (!err) {
1997                 iucv_accept_enqueue(sk, nsk);
1998                 nsk->sk_state = IUCV_CONNECTED;
1999                 sk->sk_data_ready(sk);
2000         } else
2001                 iucv_sock_kill(nsk);
2002         bh_unlock_sock(sk);
2003
2004 out:
2005         return NET_RX_SUCCESS;
2006 }
2007
2008 /**
2009  * afiucv_hs_callback_synack() - react on received SYN-ACK
2010  **/
2011 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2012 {
2013         struct iucv_sock *iucv = iucv_sk(sk);
2014         struct af_iucv_trans_hdr *trans_hdr =
2015                                         (struct af_iucv_trans_hdr *)skb->data;
2016
2017         if (!iucv)
2018                 goto out;
2019         if (sk->sk_state != IUCV_BOUND)
2020                 goto out;
2021         bh_lock_sock(sk);
2022         iucv->msglimit_peer = trans_hdr->window;
2023         sk->sk_state = IUCV_CONNECTED;
2024         sk->sk_state_change(sk);
2025         bh_unlock_sock(sk);
2026 out:
2027         kfree_skb(skb);
2028         return NET_RX_SUCCESS;
2029 }
2030
2031 /**
2032  * afiucv_hs_callback_synfin() - react on received SYN_FIN
2033  **/
2034 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2035 {
2036         struct iucv_sock *iucv = iucv_sk(sk);
2037
2038         if (!iucv)
2039                 goto out;
2040         if (sk->sk_state != IUCV_BOUND)
2041                 goto out;
2042         bh_lock_sock(sk);
2043         sk->sk_state = IUCV_DISCONN;
2044         sk->sk_state_change(sk);
2045         bh_unlock_sock(sk);
2046 out:
2047         kfree_skb(skb);
2048         return NET_RX_SUCCESS;
2049 }
2050
2051 /**
2052  * afiucv_hs_callback_fin() - react on received FIN
2053  **/
2054 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2055 {
2056         struct iucv_sock *iucv = iucv_sk(sk);
2057
2058         /* other end of connection closed */
2059         if (!iucv)
2060                 goto out;
2061         bh_lock_sock(sk);
2062         if (sk->sk_state == IUCV_CONNECTED) {
2063                 sk->sk_state = IUCV_DISCONN;
2064                 sk->sk_state_change(sk);
2065         }
2066         bh_unlock_sock(sk);
2067 out:
2068         kfree_skb(skb);
2069         return NET_RX_SUCCESS;
2070 }
2071
2072 /**
2073  * afiucv_hs_callback_win() - react on received WIN
2074  **/
2075 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2076 {
2077         struct iucv_sock *iucv = iucv_sk(sk);
2078         struct af_iucv_trans_hdr *trans_hdr =
2079                                         (struct af_iucv_trans_hdr *)skb->data;
2080
2081         if (!iucv)
2082                 return NET_RX_SUCCESS;
2083
2084         if (sk->sk_state != IUCV_CONNECTED)
2085                 return NET_RX_SUCCESS;
2086
2087         atomic_sub(trans_hdr->window, &iucv->msg_sent);
2088         iucv_sock_wake_msglim(sk);
2089         return NET_RX_SUCCESS;
2090 }
2091
2092 /**
2093  * afiucv_hs_callback_rx() - react on received data
2094  **/
2095 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2096 {
2097         struct iucv_sock *iucv = iucv_sk(sk);
2098
2099         if (!iucv) {
2100                 kfree_skb(skb);
2101                 return NET_RX_SUCCESS;
2102         }
2103
2104         if (sk->sk_state != IUCV_CONNECTED) {
2105                 kfree_skb(skb);
2106                 return NET_RX_SUCCESS;
2107         }
2108
2109         if (sk->sk_shutdown & RCV_SHUTDOWN) {
2110                 kfree_skb(skb);
2111                 return NET_RX_SUCCESS;
2112         }
2113
2114         /* write stuff from iucv_msg to skb cb */
2115         skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2116         skb_reset_transport_header(skb);
2117         skb_reset_network_header(skb);
2118         IUCV_SKB_CB(skb)->offset = 0;
2119         spin_lock(&iucv->message_q.lock);
2120         if (skb_queue_empty(&iucv->backlog_skb_q)) {
2121                 if (sock_queue_rcv_skb(sk, skb)) {
2122                         /* handle rcv queue full */
2123                         skb_queue_tail(&iucv->backlog_skb_q, skb);
2124                 }
2125         } else
2126                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2127         spin_unlock(&iucv->message_q.lock);
2128         return NET_RX_SUCCESS;
2129 }
2130
2131 /**
2132  * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2133  *                   transport
2134  *                   called from netif RX softirq
2135  **/
2136 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2137         struct packet_type *pt, struct net_device *orig_dev)
2138 {
2139         struct sock *sk;
2140         struct iucv_sock *iucv;
2141         struct af_iucv_trans_hdr *trans_hdr;
2142         char nullstring[8];
2143         int err = 0;
2144
2145         if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2146                 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2147                           (int)skb->len,
2148                           (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2149                 kfree_skb(skb);
2150                 return NET_RX_SUCCESS;
2151         }
2152         if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2153                 if (skb_linearize(skb)) {
2154                         WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2155                                   (int)skb->len);
2156                         kfree_skb(skb);
2157                         return NET_RX_SUCCESS;
2158                 }
2159         skb_pull(skb, ETH_HLEN);
2160         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2161         EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2162         EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2163         EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2164         EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2165         memset(nullstring, 0, sizeof(nullstring));
2166         iucv = NULL;
2167         sk = NULL;
2168         read_lock(&iucv_sk_list.lock);
2169         sk_for_each(sk, &iucv_sk_list.head) {
2170                 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2171                         if ((!memcmp(&iucv_sk(sk)->src_name,
2172                                      trans_hdr->destAppName, 8)) &&
2173                             (!memcmp(&iucv_sk(sk)->src_user_id,
2174                                      trans_hdr->destUserID, 8)) &&
2175                             (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2176                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2177                                      nullstring, 8))) {
2178                                 iucv = iucv_sk(sk);
2179                                 break;
2180                         }
2181                 } else {
2182                         if ((!memcmp(&iucv_sk(sk)->src_name,
2183                                      trans_hdr->destAppName, 8)) &&
2184                             (!memcmp(&iucv_sk(sk)->src_user_id,
2185                                      trans_hdr->destUserID, 8)) &&
2186                             (!memcmp(&iucv_sk(sk)->dst_name,
2187                                      trans_hdr->srcAppName, 8)) &&
2188                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2189                                      trans_hdr->srcUserID, 8))) {
2190                                 iucv = iucv_sk(sk);
2191                                 break;
2192                         }
2193                 }
2194         }
2195         read_unlock(&iucv_sk_list.lock);
2196         if (!iucv)
2197                 sk = NULL;
2198
2199         /* no sock
2200         how should we send with no sock
2201         1) send without sock no send rc checking?
2202         2) introduce default sock to handle this cases
2203
2204          SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2205          data -> send FIN
2206          SYN|ACK, SYN|FIN, FIN -> no action? */
2207
2208         switch (trans_hdr->flags) {
2209         case AF_IUCV_FLAG_SYN:
2210                 /* connect request */
2211                 err = afiucv_hs_callback_syn(sk, skb);
2212                 break;
2213         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2214                 /* connect request confirmed */
2215                 err = afiucv_hs_callback_synack(sk, skb);
2216                 break;
2217         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2218                 /* connect request refused */
2219                 err = afiucv_hs_callback_synfin(sk, skb);
2220                 break;
2221         case (AF_IUCV_FLAG_FIN):
2222                 /* close request */
2223                 err = afiucv_hs_callback_fin(sk, skb);
2224                 break;
2225         case (AF_IUCV_FLAG_WIN):
2226                 err = afiucv_hs_callback_win(sk, skb);
2227                 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2228                         kfree_skb(skb);
2229                         break;
2230                 }
2231                 /* fall through and receive non-zero length data */
2232         case (AF_IUCV_FLAG_SHT):
2233                 /* shutdown request */
2234                 /* fall through and receive zero length data */
2235         case 0:
2236                 /* plain data frame */
2237                 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2238                 err = afiucv_hs_callback_rx(sk, skb);
2239                 break;
2240         default:
2241                 ;
2242         }
2243
2244         return err;
2245 }
2246
2247 /**
2248  * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2249  *                                 transport
2250  **/
2251 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2252                                         enum iucv_tx_notify n)
2253 {
2254         struct sock *isk = skb->sk;
2255         struct sock *sk = NULL;
2256         struct iucv_sock *iucv = NULL;
2257         struct sk_buff_head *list;
2258         struct sk_buff *list_skb;
2259         struct sk_buff *nskb;
2260         unsigned long flags;
2261
2262         read_lock_irqsave(&iucv_sk_list.lock, flags);
2263         sk_for_each(sk, &iucv_sk_list.head)
2264                 if (sk == isk) {
2265                         iucv = iucv_sk(sk);
2266                         break;
2267                 }
2268         read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2269
2270         if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2271                 return;
2272
2273         list = &iucv->send_skb_q;
2274         spin_lock_irqsave(&list->lock, flags);
2275         if (skb_queue_empty(list))
2276                 goto out_unlock;
2277         list_skb = list->next;
2278         nskb = list_skb->next;
2279         while (list_skb != (struct sk_buff *)list) {
2280                 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2281                         switch (n) {
2282                         case TX_NOTIFY_OK:
2283                                 __skb_unlink(list_skb, list);
2284                                 kfree_skb(list_skb);
2285                                 iucv_sock_wake_msglim(sk);
2286                                 break;
2287                         case TX_NOTIFY_PENDING:
2288                                 atomic_inc(&iucv->pendings);
2289                                 break;
2290                         case TX_NOTIFY_DELAYED_OK:
2291                                 __skb_unlink(list_skb, list);
2292                                 atomic_dec(&iucv->pendings);
2293                                 if (atomic_read(&iucv->pendings) <= 0)
2294                                         iucv_sock_wake_msglim(sk);
2295                                 kfree_skb(list_skb);
2296                                 break;
2297                         case TX_NOTIFY_UNREACHABLE:
2298                         case TX_NOTIFY_DELAYED_UNREACHABLE:
2299                         case TX_NOTIFY_TPQFULL: /* not yet used */
2300                         case TX_NOTIFY_GENERALERROR:
2301                         case TX_NOTIFY_DELAYED_GENERALERROR:
2302                                 __skb_unlink(list_skb, list);
2303                                 kfree_skb(list_skb);
2304                                 if (sk->sk_state == IUCV_CONNECTED) {
2305                                         sk->sk_state = IUCV_DISCONN;
2306                                         sk->sk_state_change(sk);
2307                                 }
2308                                 break;
2309                         }
2310                         break;
2311                 }
2312                 list_skb = nskb;
2313                 nskb = nskb->next;
2314         }
2315 out_unlock:
2316         spin_unlock_irqrestore(&list->lock, flags);
2317
2318         if (sk->sk_state == IUCV_CLOSING) {
2319                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2320                         sk->sk_state = IUCV_CLOSED;
2321                         sk->sk_state_change(sk);
2322                 }
2323         }
2324
2325 }
2326
2327 /*
2328  * afiucv_netdev_event: handle netdev notifier chain events
2329  */
2330 static int afiucv_netdev_event(struct notifier_block *this,
2331                                unsigned long event, void *ptr)
2332 {
2333         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2334         struct sock *sk;
2335         struct iucv_sock *iucv;
2336
2337         switch (event) {
2338         case NETDEV_REBOOT:
2339         case NETDEV_GOING_DOWN:
2340                 sk_for_each(sk, &iucv_sk_list.head) {
2341                         iucv = iucv_sk(sk);
2342                         if ((iucv->hs_dev == event_dev) &&
2343                             (sk->sk_state == IUCV_CONNECTED)) {
2344                                 if (event == NETDEV_GOING_DOWN)
2345                                         iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2346                                 sk->sk_state = IUCV_DISCONN;
2347                                 sk->sk_state_change(sk);
2348                         }
2349                 }
2350                 break;
2351         case NETDEV_DOWN:
2352         case NETDEV_UNREGISTER:
2353         default:
2354                 break;
2355         }
2356         return NOTIFY_DONE;
2357 }
2358
2359 static struct notifier_block afiucv_netdev_notifier = {
2360         .notifier_call = afiucv_netdev_event,
2361 };
2362
2363 static const struct proto_ops iucv_sock_ops = {
2364         .family         = PF_IUCV,
2365         .owner          = THIS_MODULE,
2366         .release        = iucv_sock_release,
2367         .bind           = iucv_sock_bind,
2368         .connect        = iucv_sock_connect,
2369         .listen         = iucv_sock_listen,
2370         .accept         = iucv_sock_accept,
2371         .getname        = iucv_sock_getname,
2372         .sendmsg        = iucv_sock_sendmsg,
2373         .recvmsg        = iucv_sock_recvmsg,
2374         .poll           = iucv_sock_poll,
2375         .ioctl          = sock_no_ioctl,
2376         .mmap           = sock_no_mmap,
2377         .socketpair     = sock_no_socketpair,
2378         .shutdown       = iucv_sock_shutdown,
2379         .setsockopt     = iucv_sock_setsockopt,
2380         .getsockopt     = iucv_sock_getsockopt,
2381 };
2382
2383 static const struct net_proto_family iucv_sock_family_ops = {
2384         .family = AF_IUCV,
2385         .owner  = THIS_MODULE,
2386         .create = iucv_sock_create,
2387 };
2388
2389 static struct packet_type iucv_packet_type = {
2390         .type = cpu_to_be16(ETH_P_AF_IUCV),
2391         .func = afiucv_hs_rcv,
2392 };
2393
2394 static int afiucv_iucv_init(void)
2395 {
2396         int err;
2397
2398         err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2399         if (err)
2400                 goto out;
2401         /* establish dummy device */
2402         af_iucv_driver.bus = pr_iucv->bus;
2403         err = driver_register(&af_iucv_driver);
2404         if (err)
2405                 goto out_iucv;
2406         af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2407         if (!af_iucv_dev) {
2408                 err = -ENOMEM;
2409                 goto out_driver;
2410         }
2411         dev_set_name(af_iucv_dev, "af_iucv");
2412         af_iucv_dev->bus = pr_iucv->bus;
2413         af_iucv_dev->parent = pr_iucv->root;
2414         af_iucv_dev->release = (void (*)(struct device *))kfree;
2415         af_iucv_dev->driver = &af_iucv_driver;
2416         err = device_register(af_iucv_dev);
2417         if (err)
2418                 goto out_driver;
2419         return 0;
2420
2421 out_driver:
2422         driver_unregister(&af_iucv_driver);
2423 out_iucv:
2424         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2425 out:
2426         return err;
2427 }
2428
2429 static int __init afiucv_init(void)
2430 {
2431         int err;
2432
2433         if (MACHINE_IS_VM) {
2434                 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2435                 if (unlikely(err)) {
2436                         WARN_ON(err);
2437                         err = -EPROTONOSUPPORT;
2438                         goto out;
2439                 }
2440
2441                 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2442                 if (!pr_iucv) {
2443                         printk(KERN_WARNING "iucv_if lookup failed\n");
2444                         memset(&iucv_userid, 0, sizeof(iucv_userid));
2445                 }
2446         } else {
2447                 memset(&iucv_userid, 0, sizeof(iucv_userid));
2448                 pr_iucv = NULL;
2449         }
2450
2451         err = proto_register(&iucv_proto, 0);
2452         if (err)
2453                 goto out;
2454         err = sock_register(&iucv_sock_family_ops);
2455         if (err)
2456                 goto out_proto;
2457
2458         if (pr_iucv) {
2459                 err = afiucv_iucv_init();
2460                 if (err)
2461                         goto out_sock;
2462         } else
2463                 register_netdevice_notifier(&afiucv_netdev_notifier);
2464         dev_add_pack(&iucv_packet_type);
2465         return 0;
2466
2467 out_sock:
2468         sock_unregister(PF_IUCV);
2469 out_proto:
2470         proto_unregister(&iucv_proto);
2471 out:
2472         if (pr_iucv)
2473                 symbol_put(iucv_if);
2474         return err;
2475 }
2476
2477 static void __exit afiucv_exit(void)
2478 {
2479         if (pr_iucv) {
2480                 device_unregister(af_iucv_dev);
2481                 driver_unregister(&af_iucv_driver);
2482                 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2483                 symbol_put(iucv_if);
2484         } else
2485                 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2486         dev_remove_pack(&iucv_packet_type);
2487         sock_unregister(PF_IUCV);
2488         proto_unregister(&iucv_proto);
2489 }
2490
2491 module_init(afiucv_init);
2492 module_exit(afiucv_exit);
2493
2494 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2495 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2496 MODULE_VERSION(VERSION);
2497 MODULE_LICENSE("GPL");
2498 MODULE_ALIAS_NETPROTO(PF_IUCV);
2499