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 = 0;
1040         size_t linear;
1041         struct sk_buff *skb;
1042         struct iucv_message txmsg = {0};
1043         struct cmsghdr *cmsg;
1044         int cmsg_done;
1045         long timeo;
1046         char user_id[9];
1047         char appl_id[9];
1048         int err;
1049         int noblock = msg->msg_flags & MSG_DONTWAIT;
1050
1051         err = sock_error(sk);
1052         if (err)
1053                 return err;
1054
1055         if (msg->msg_flags & MSG_OOB)
1056                 return -EOPNOTSUPP;
1057
1058         /* SOCK_SEQPACKET: we do not support segmented records */
1059         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1060                 return -EOPNOTSUPP;
1061
1062         lock_sock(sk);
1063
1064         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1065                 err = -EPIPE;
1066                 goto out;
1067         }
1068
1069         /* Return if the socket is not in connected state */
1070         if (sk->sk_state != IUCV_CONNECTED) {
1071                 err = -ENOTCONN;
1072                 goto out;
1073         }
1074
1075         /* initialize defaults */
1076         cmsg_done   = 0;        /* check for duplicate headers */
1077         txmsg.class = 0;
1078
1079         /* iterate over control messages */
1080         for_each_cmsghdr(cmsg, msg) {
1081                 if (!CMSG_OK(msg, cmsg)) {
1082                         err = -EINVAL;
1083                         goto out;
1084                 }
1085
1086                 if (cmsg->cmsg_level != SOL_IUCV)
1087                         continue;
1088
1089                 if (cmsg->cmsg_type & cmsg_done) {
1090                         err = -EINVAL;
1091                         goto out;
1092                 }
1093                 cmsg_done |= cmsg->cmsg_type;
1094
1095                 switch (cmsg->cmsg_type) {
1096                 case SCM_IUCV_TRGCLS:
1097                         if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1098                                 err = -EINVAL;
1099                                 goto out;
1100                         }
1101
1102                         /* set iucv message target class */
1103                         memcpy(&txmsg.class,
1104                                 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1105
1106                         break;
1107
1108                 default:
1109                         err = -EINVAL;
1110                         goto out;
1111                 }
1112         }
1113
1114         /* allocate one skb for each iucv message:
1115          * this is fine for SOCK_SEQPACKET (unless we want to support
1116          * segmented records using the MSG_EOR flag), but
1117          * for SOCK_STREAM we might want to improve it in future */
1118         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1119                 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1120                 linear = len;
1121         } else {
1122                 if (len < PAGE_SIZE) {
1123                         linear = len;
1124                 } else {
1125                         /* In nonlinear "classic" iucv skb,
1126                          * reserve space for iucv_array
1127                          */
1128                         headroom = sizeof(struct iucv_array) *
1129                                    (MAX_SKB_FRAGS + 1);
1130                         linear = PAGE_SIZE - headroom;
1131                 }
1132         }
1133         skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1134                                    noblock, &err, 0);
1135         if (!skb)
1136                 goto out;
1137         if (headroom)
1138                 skb_reserve(skb, headroom);
1139         skb_put(skb, linear);
1140         skb->len = len;
1141         skb->data_len = len - linear;
1142         err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1143         if (err)
1144                 goto fail;
1145
1146         /* wait if outstanding messages for iucv path has reached */
1147         timeo = sock_sndtimeo(sk, noblock);
1148         err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1149         if (err)
1150                 goto fail;
1151
1152         /* return -ECONNRESET if the socket is no longer connected */
1153         if (sk->sk_state != IUCV_CONNECTED) {
1154                 err = -ECONNRESET;
1155                 goto fail;
1156         }
1157
1158         /* increment and save iucv message tag for msg_completion cbk */
1159         txmsg.tag = iucv->send_tag++;
1160         IUCV_SKB_CB(skb)->tag = txmsg.tag;
1161
1162         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1163                 atomic_inc(&iucv->msg_sent);
1164                 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1165                 if (err) {
1166                         atomic_dec(&iucv->msg_sent);
1167                         goto fail;
1168                 }
1169         } else { /* Classic VM IUCV transport */
1170                 skb_queue_tail(&iucv->send_skb_q, skb);
1171
1172                 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1173                     skb->len <= 7) {
1174                         err = iucv_send_iprm(iucv->path, &txmsg, skb);
1175
1176                         /* on success: there is no message_complete callback */
1177                         /* for an IPRMDATA msg; remove skb from send queue   */
1178                         if (err == 0) {
1179                                 skb_unlink(skb, &iucv->send_skb_q);
1180                                 kfree_skb(skb);
1181                         }
1182
1183                         /* this error should never happen since the     */
1184                         /* IUCV_IPRMDATA path flag is set... sever path */
1185                         if (err == 0x15) {
1186                                 pr_iucv->path_sever(iucv->path, NULL);
1187                                 skb_unlink(skb, &iucv->send_skb_q);
1188                                 err = -EPIPE;
1189                                 goto fail;
1190                         }
1191                 } else if (skb_is_nonlinear(skb)) {
1192                         struct iucv_array *iba = (struct iucv_array *)skb->head;
1193                         int i;
1194
1195                         /* skip iucv_array lying in the headroom */
1196                         iba[0].address = (u32)(addr_t)skb->data;
1197                         iba[0].length = (u32)skb_headlen(skb);
1198                         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1199                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1200
1201                                 iba[i + 1].address =
1202                                         (u32)(addr_t)skb_frag_address(frag);
1203                                 iba[i + 1].length = (u32)skb_frag_size(frag);
1204                         }
1205                         err = pr_iucv->message_send(iucv->path, &txmsg,
1206                                                     IUCV_IPBUFLST, 0,
1207                                                     (void *)iba, skb->len);
1208                 } else { /* non-IPRM Linear skb */
1209                         err = pr_iucv->message_send(iucv->path, &txmsg,
1210                                         0, 0, (void *)skb->data, skb->len);
1211                 }
1212                 if (err) {
1213                         if (err == 3) {
1214                                 user_id[8] = 0;
1215                                 memcpy(user_id, iucv->dst_user_id, 8);
1216                                 appl_id[8] = 0;
1217                                 memcpy(appl_id, iucv->dst_name, 8);
1218                                 pr_err(
1219                 "Application %s on z/VM guest %s exceeds message limit\n",
1220                                         appl_id, user_id);
1221                                 err = -EAGAIN;
1222                         } else {
1223                                 err = -EPIPE;
1224                         }
1225                         skb_unlink(skb, &iucv->send_skb_q);
1226                         goto fail;
1227                 }
1228         }
1229
1230         release_sock(sk);
1231         return len;
1232
1233 fail:
1234         kfree_skb(skb);
1235 out:
1236         release_sock(sk);
1237         return err;
1238 }
1239
1240 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1241 {
1242         size_t headroom, linear;
1243         struct sk_buff *skb;
1244         int err;
1245
1246         if (len < PAGE_SIZE) {
1247                 headroom = 0;
1248                 linear = len;
1249         } else {
1250                 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1251                 linear = PAGE_SIZE - headroom;
1252         }
1253         skb = alloc_skb_with_frags(headroom + linear, len - linear,
1254                                    0, &err, GFP_ATOMIC | GFP_DMA);
1255         WARN_ONCE(!skb,
1256                   "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1257                   len, err);
1258         if (skb) {
1259                 if (headroom)
1260                         skb_reserve(skb, headroom);
1261                 skb_put(skb, linear);
1262                 skb->len = len;
1263                 skb->data_len = len - linear;
1264         }
1265         return skb;
1266 }
1267
1268 /* iucv_process_message() - Receive a single outstanding IUCV message
1269  *
1270  * Locking: must be called with message_q.lock held
1271  */
1272 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1273                                  struct iucv_path *path,
1274                                  struct iucv_message *msg)
1275 {
1276         int rc;
1277         unsigned int len;
1278
1279         len = iucv_msg_length(msg);
1280
1281         /* store msg target class in the second 4 bytes of skb ctrl buffer */
1282         /* Note: the first 4 bytes are reserved for msg tag */
1283         IUCV_SKB_CB(skb)->class = msg->class;
1284
1285         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1286         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1287                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1288                         skb->data = NULL;
1289                         skb->len = 0;
1290                 }
1291         } else {
1292                 if (skb_is_nonlinear(skb)) {
1293                         struct iucv_array *iba = (struct iucv_array *)skb->head;
1294                         int i;
1295
1296                         iba[0].address = (u32)(addr_t)skb->data;
1297                         iba[0].length = (u32)skb_headlen(skb);
1298                         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1299                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1300
1301                                 iba[i + 1].address =
1302                                         (u32)(addr_t)skb_frag_address(frag);
1303                                 iba[i + 1].length = (u32)skb_frag_size(frag);
1304                         }
1305                         rc = pr_iucv->message_receive(path, msg,
1306                                               IUCV_IPBUFLST,
1307                                               (void *)iba, len, NULL);
1308                 } else {
1309                         rc = pr_iucv->message_receive(path, msg,
1310                                               msg->flags & IUCV_IPRMDATA,
1311                                               skb->data, len, NULL);
1312                 }
1313                 if (rc) {
1314                         kfree_skb(skb);
1315                         return;
1316                 }
1317                 WARN_ON_ONCE(skb->len != len);
1318         }
1319
1320         IUCV_SKB_CB(skb)->offset = 0;
1321         if (sock_queue_rcv_skb(sk, skb))
1322                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1323 }
1324
1325 /* iucv_process_message_q() - Process outstanding IUCV messages
1326  *
1327  * Locking: must be called with message_q.lock held
1328  */
1329 static void iucv_process_message_q(struct sock *sk)
1330 {
1331         struct iucv_sock *iucv = iucv_sk(sk);
1332         struct sk_buff *skb;
1333         struct sock_msg_q *p, *n;
1334
1335         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1336                 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1337                 if (!skb)
1338                         break;
1339                 iucv_process_message(sk, skb, p->path, &p->msg);
1340                 list_del(&p->list);
1341                 kfree(p);
1342                 if (!skb_queue_empty(&iucv->backlog_skb_q))
1343                         break;
1344         }
1345 }
1346
1347 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1348                              size_t len, int flags)
1349 {
1350         int noblock = flags & MSG_DONTWAIT;
1351         struct sock *sk = sock->sk;
1352         struct iucv_sock *iucv = iucv_sk(sk);
1353         unsigned int copied, rlen;
1354         struct sk_buff *skb, *rskb, *cskb;
1355         int err = 0;
1356         u32 offset;
1357
1358         if ((sk->sk_state == IUCV_DISCONN) &&
1359             skb_queue_empty(&iucv->backlog_skb_q) &&
1360             skb_queue_empty(&sk->sk_receive_queue) &&
1361             list_empty(&iucv->message_q.list))
1362                 return 0;
1363
1364         if (flags & (MSG_OOB))
1365                 return -EOPNOTSUPP;
1366
1367         /* receive/dequeue next skb:
1368          * the function understands MSG_PEEK and, thus, does not dequeue skb */
1369         skb = skb_recv_datagram(sk, flags, noblock, &err);
1370         if (!skb) {
1371                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1372                         return 0;
1373                 return err;
1374         }
1375
1376         offset = IUCV_SKB_CB(skb)->offset;
1377         rlen   = skb->len - offset;             /* real length of skb */
1378         copied = min_t(unsigned int, rlen, len);
1379         if (!rlen)
1380                 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1381
1382         cskb = skb;
1383         if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1384                 if (!(flags & MSG_PEEK))
1385                         skb_queue_head(&sk->sk_receive_queue, skb);
1386                 return -EFAULT;
1387         }
1388
1389         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1390         if (sk->sk_type == SOCK_SEQPACKET) {
1391                 if (copied < rlen)
1392                         msg->msg_flags |= MSG_TRUNC;
1393                 /* each iucv message contains a complete record */
1394                 msg->msg_flags |= MSG_EOR;
1395         }
1396
1397         /* create control message to store iucv msg target class:
1398          * get the trgcls from the control buffer of the skb due to
1399          * fragmentation of original iucv message. */
1400         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1401                        sizeof(IUCV_SKB_CB(skb)->class),
1402                        (void *)&IUCV_SKB_CB(skb)->class);
1403         if (err) {
1404                 if (!(flags & MSG_PEEK))
1405                         skb_queue_head(&sk->sk_receive_queue, skb);
1406                 return err;
1407         }
1408
1409         /* Mark read part of skb as used */
1410         if (!(flags & MSG_PEEK)) {
1411
1412                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1413                 if (sk->sk_type == SOCK_STREAM) {
1414                         if (copied < rlen) {
1415                                 IUCV_SKB_CB(skb)->offset = offset + copied;
1416                                 skb_queue_head(&sk->sk_receive_queue, skb);
1417                                 goto done;
1418                         }
1419                 }
1420
1421                 kfree_skb(skb);
1422                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1423                         atomic_inc(&iucv->msg_recv);
1424                         if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1425                                 WARN_ON(1);
1426                                 iucv_sock_close(sk);
1427                                 return -EFAULT;
1428                         }
1429                 }
1430
1431                 /* Queue backlog skbs */
1432                 spin_lock_bh(&iucv->message_q.lock);
1433                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1434                 while (rskb) {
1435                         IUCV_SKB_CB(rskb)->offset = 0;
1436                         if (sock_queue_rcv_skb(sk, rskb)) {
1437                                 skb_queue_head(&iucv->backlog_skb_q,
1438                                                 rskb);
1439                                 break;
1440                         } else {
1441                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1442                         }
1443                 }
1444                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1445                         if (!list_empty(&iucv->message_q.list))
1446                                 iucv_process_message_q(sk);
1447                         if (atomic_read(&iucv->msg_recv) >=
1448                                                         iucv->msglimit / 2) {
1449                                 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1450                                 if (err) {
1451                                         sk->sk_state = IUCV_DISCONN;
1452                                         sk->sk_state_change(sk);
1453                                 }
1454                         }
1455                 }
1456                 spin_unlock_bh(&iucv->message_q.lock);
1457         }
1458
1459 done:
1460         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1461         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1462                 copied = rlen;
1463
1464         return copied;
1465 }
1466
1467 static inline unsigned int iucv_accept_poll(struct sock *parent)
1468 {
1469         struct iucv_sock *isk, *n;
1470         struct sock *sk;
1471
1472         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1473                 sk = (struct sock *) isk;
1474
1475                 if (sk->sk_state == IUCV_CONNECTED)
1476                         return POLLIN | POLLRDNORM;
1477         }
1478
1479         return 0;
1480 }
1481
1482 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1483                             poll_table *wait)
1484 {
1485         struct sock *sk = sock->sk;
1486         unsigned int mask = 0;
1487
1488         sock_poll_wait(file, sk_sleep(sk), wait);
1489
1490         if (sk->sk_state == IUCV_LISTEN)
1491                 return iucv_accept_poll(sk);
1492
1493         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1494                 mask |= POLLERR |
1495                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1496
1497         if (sk->sk_shutdown & RCV_SHUTDOWN)
1498                 mask |= POLLRDHUP;
1499
1500         if (sk->sk_shutdown == SHUTDOWN_MASK)
1501                 mask |= POLLHUP;
1502
1503         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1504             (sk->sk_shutdown & RCV_SHUTDOWN))
1505                 mask |= POLLIN | POLLRDNORM;
1506
1507         if (sk->sk_state == IUCV_CLOSED)
1508                 mask |= POLLHUP;
1509
1510         if (sk->sk_state == IUCV_DISCONN)
1511                 mask |= POLLIN;
1512
1513         if (sock_writeable(sk) && iucv_below_msglim(sk))
1514                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1515         else
1516                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1517
1518         return mask;
1519 }
1520
1521 static int iucv_sock_shutdown(struct socket *sock, int how)
1522 {
1523         struct sock *sk = sock->sk;
1524         struct iucv_sock *iucv = iucv_sk(sk);
1525         struct iucv_message txmsg;
1526         int err = 0;
1527
1528         how++;
1529
1530         if ((how & ~SHUTDOWN_MASK) || !how)
1531                 return -EINVAL;
1532
1533         lock_sock(sk);
1534         switch (sk->sk_state) {
1535         case IUCV_LISTEN:
1536         case IUCV_DISCONN:
1537         case IUCV_CLOSING:
1538         case IUCV_CLOSED:
1539                 err = -ENOTCONN;
1540                 goto fail;
1541         default:
1542                 break;
1543         }
1544
1545         if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) &&
1546             sk->sk_state == IUCV_CONNECTED) {
1547                 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1548                         txmsg.class = 0;
1549                         txmsg.tag = 0;
1550                         err = pr_iucv->message_send(iucv->path, &txmsg,
1551                                 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1552                         if (err) {
1553                                 switch (err) {
1554                                 case 1:
1555                                         err = -ENOTCONN;
1556                                         break;
1557                                 case 2:
1558                                         err = -ECONNRESET;
1559                                         break;
1560                                 default:
1561                                         err = -ENOTCONN;
1562                                         break;
1563                                 }
1564                         }
1565                 } else
1566                         iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1567         }
1568
1569         sk->sk_shutdown |= how;
1570         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1571                 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1572                     iucv->path) {
1573                         err = pr_iucv->path_quiesce(iucv->path, NULL);
1574                         if (err)
1575                                 err = -ENOTCONN;
1576 /*                      skb_queue_purge(&sk->sk_receive_queue); */
1577                 }
1578                 skb_queue_purge(&sk->sk_receive_queue);
1579         }
1580
1581         /* Wake up anyone sleeping in poll */
1582         sk->sk_state_change(sk);
1583
1584 fail:
1585         release_sock(sk);
1586         return err;
1587 }
1588
1589 static int iucv_sock_release(struct socket *sock)
1590 {
1591         struct sock *sk = sock->sk;
1592         int err = 0;
1593
1594         if (!sk)
1595                 return 0;
1596
1597         iucv_sock_close(sk);
1598
1599         sock_orphan(sk);
1600         iucv_sock_kill(sk);
1601         return err;
1602 }
1603
1604 /* getsockopt and setsockopt */
1605 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1606                                 char __user *optval, unsigned int optlen)
1607 {
1608         struct sock *sk = sock->sk;
1609         struct iucv_sock *iucv = iucv_sk(sk);
1610         int val;
1611         int rc;
1612
1613         if (level != SOL_IUCV)
1614                 return -ENOPROTOOPT;
1615
1616         if (optlen < sizeof(int))
1617                 return -EINVAL;
1618
1619         if (get_user(val, (int __user *) optval))
1620                 return -EFAULT;
1621
1622         rc = 0;
1623
1624         lock_sock(sk);
1625         switch (optname) {
1626         case SO_IPRMDATA_MSG:
1627                 if (val)
1628                         iucv->flags |= IUCV_IPRMDATA;
1629                 else
1630                         iucv->flags &= ~IUCV_IPRMDATA;
1631                 break;
1632         case SO_MSGLIMIT:
1633                 switch (sk->sk_state) {
1634                 case IUCV_OPEN:
1635                 case IUCV_BOUND:
1636                         if (val < 1 || val > (u16)(~0))
1637                                 rc = -EINVAL;
1638                         else
1639                                 iucv->msglimit = val;
1640                         break;
1641                 default:
1642                         rc = -EINVAL;
1643                         break;
1644                 }
1645                 break;
1646         default:
1647                 rc = -ENOPROTOOPT;
1648                 break;
1649         }
1650         release_sock(sk);
1651
1652         return rc;
1653 }
1654
1655 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1656                                 char __user *optval, int __user *optlen)
1657 {
1658         struct sock *sk = sock->sk;
1659         struct iucv_sock *iucv = iucv_sk(sk);
1660         unsigned int val;
1661         int len;
1662
1663         if (level != SOL_IUCV)
1664                 return -ENOPROTOOPT;
1665
1666         if (get_user(len, optlen))
1667                 return -EFAULT;
1668
1669         if (len < 0)
1670                 return -EINVAL;
1671
1672         len = min_t(unsigned int, len, sizeof(int));
1673
1674         switch (optname) {
1675         case SO_IPRMDATA_MSG:
1676                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1677                 break;
1678         case SO_MSGLIMIT:
1679                 lock_sock(sk);
1680                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1681                                            : iucv->msglimit;    /* default */
1682                 release_sock(sk);
1683                 break;
1684         case SO_MSGSIZE:
1685                 if (sk->sk_state == IUCV_OPEN)
1686                         return -EBADFD;
1687                 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1688                                 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1689                                 0x7fffffff;
1690                 break;
1691         default:
1692                 return -ENOPROTOOPT;
1693         }
1694
1695         if (put_user(len, optlen))
1696                 return -EFAULT;
1697         if (copy_to_user(optval, &val, len))
1698                 return -EFAULT;
1699
1700         return 0;
1701 }
1702
1703
1704 /* Callback wrappers - called from iucv base support */
1705 static int iucv_callback_connreq(struct iucv_path *path,
1706                                  u8 ipvmid[8], u8 ipuser[16])
1707 {
1708         unsigned char user_data[16];
1709         unsigned char nuser_data[16];
1710         unsigned char src_name[8];
1711         struct sock *sk, *nsk;
1712         struct iucv_sock *iucv, *niucv;
1713         int err;
1714
1715         memcpy(src_name, ipuser, 8);
1716         EBCASC(src_name, 8);
1717         /* Find out if this path belongs to af_iucv. */
1718         read_lock(&iucv_sk_list.lock);
1719         iucv = NULL;
1720         sk = NULL;
1721         sk_for_each(sk, &iucv_sk_list.head)
1722                 if (sk->sk_state == IUCV_LISTEN &&
1723                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1724                         /*
1725                          * Found a listening socket with
1726                          * src_name == ipuser[0-7].
1727                          */
1728                         iucv = iucv_sk(sk);
1729                         break;
1730                 }
1731         read_unlock(&iucv_sk_list.lock);
1732         if (!iucv)
1733                 /* No socket found, not one of our paths. */
1734                 return -EINVAL;
1735
1736         bh_lock_sock(sk);
1737
1738         /* Check if parent socket is listening */
1739         low_nmcpy(user_data, iucv->src_name);
1740         high_nmcpy(user_data, iucv->dst_name);
1741         ASCEBC(user_data, sizeof(user_data));
1742         if (sk->sk_state != IUCV_LISTEN) {
1743                 err = pr_iucv->path_sever(path, user_data);
1744                 iucv_path_free(path);
1745                 goto fail;
1746         }
1747
1748         /* Check for backlog size */
1749         if (sk_acceptq_is_full(sk)) {
1750                 err = pr_iucv->path_sever(path, user_data);
1751                 iucv_path_free(path);
1752                 goto fail;
1753         }
1754
1755         /* Create the new socket */
1756         nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1757         if (!nsk) {
1758                 err = pr_iucv->path_sever(path, user_data);
1759                 iucv_path_free(path);
1760                 goto fail;
1761         }
1762
1763         niucv = iucv_sk(nsk);
1764         iucv_sock_init(nsk, sk);
1765
1766         /* Set the new iucv_sock */
1767         memcpy(niucv->dst_name, ipuser + 8, 8);
1768         EBCASC(niucv->dst_name, 8);
1769         memcpy(niucv->dst_user_id, ipvmid, 8);
1770         memcpy(niucv->src_name, iucv->src_name, 8);
1771         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1772         niucv->path = path;
1773
1774         /* Call iucv_accept */
1775         high_nmcpy(nuser_data, ipuser + 8);
1776         memcpy(nuser_data + 8, niucv->src_name, 8);
1777         ASCEBC(nuser_data + 8, 8);
1778
1779         /* set message limit for path based on msglimit of accepting socket */
1780         niucv->msglimit = iucv->msglimit;
1781         path->msglim = iucv->msglimit;
1782         err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1783         if (err) {
1784                 iucv_sever_path(nsk, 1);
1785                 iucv_sock_kill(nsk);
1786                 goto fail;
1787         }
1788
1789         iucv_accept_enqueue(sk, nsk);
1790
1791         /* Wake up accept */
1792         nsk->sk_state = IUCV_CONNECTED;
1793         sk->sk_data_ready(sk);
1794         err = 0;
1795 fail:
1796         bh_unlock_sock(sk);
1797         return 0;
1798 }
1799
1800 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1801 {
1802         struct sock *sk = path->private;
1803
1804         sk->sk_state = IUCV_CONNECTED;
1805         sk->sk_state_change(sk);
1806 }
1807
1808 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1809 {
1810         struct sock *sk = path->private;
1811         struct iucv_sock *iucv = iucv_sk(sk);
1812         struct sk_buff *skb;
1813         struct sock_msg_q *save_msg;
1814         int len;
1815
1816         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1817                 pr_iucv->message_reject(path, msg);
1818                 return;
1819         }
1820
1821         spin_lock(&iucv->message_q.lock);
1822
1823         if (!list_empty(&iucv->message_q.list) ||
1824             !skb_queue_empty(&iucv->backlog_skb_q))
1825                 goto save_message;
1826
1827         len = atomic_read(&sk->sk_rmem_alloc);
1828         len += SKB_TRUESIZE(iucv_msg_length(msg));
1829         if (len > sk->sk_rcvbuf)
1830                 goto save_message;
1831
1832         skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1833         if (!skb)
1834                 goto save_message;
1835
1836         iucv_process_message(sk, skb, path, msg);
1837         goto out_unlock;
1838
1839 save_message:
1840         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1841         if (!save_msg)
1842                 goto out_unlock;
1843         save_msg->path = path;
1844         save_msg->msg = *msg;
1845
1846         list_add_tail(&save_msg->list, &iucv->message_q.list);
1847
1848 out_unlock:
1849         spin_unlock(&iucv->message_q.lock);
1850 }
1851
1852 static void iucv_callback_txdone(struct iucv_path *path,
1853                                  struct iucv_message *msg)
1854 {
1855         struct sock *sk = path->private;
1856         struct sk_buff *this = NULL;
1857         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1858         struct sk_buff *list_skb = list->next;
1859         unsigned long flags;
1860
1861         bh_lock_sock(sk);
1862         if (!skb_queue_empty(list)) {
1863                 spin_lock_irqsave(&list->lock, flags);
1864
1865                 while (list_skb != (struct sk_buff *)list) {
1866                         if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1867                                 this = list_skb;
1868                                 break;
1869                         }
1870                         list_skb = list_skb->next;
1871                 }
1872                 if (this)
1873                         __skb_unlink(this, list);
1874
1875                 spin_unlock_irqrestore(&list->lock, flags);
1876
1877                 if (this) {
1878                         kfree_skb(this);
1879                         /* wake up any process waiting for sending */
1880                         iucv_sock_wake_msglim(sk);
1881                 }
1882         }
1883
1884         if (sk->sk_state == IUCV_CLOSING) {
1885                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1886                         sk->sk_state = IUCV_CLOSED;
1887                         sk->sk_state_change(sk);
1888                 }
1889         }
1890         bh_unlock_sock(sk);
1891
1892 }
1893
1894 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1895 {
1896         struct sock *sk = path->private;
1897
1898         if (sk->sk_state == IUCV_CLOSED)
1899                 return;
1900
1901         bh_lock_sock(sk);
1902         iucv_sever_path(sk, 1);
1903         sk->sk_state = IUCV_DISCONN;
1904
1905         sk->sk_state_change(sk);
1906         bh_unlock_sock(sk);
1907 }
1908
1909 /* called if the other communication side shuts down its RECV direction;
1910  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1911  */
1912 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1913 {
1914         struct sock *sk = path->private;
1915
1916         bh_lock_sock(sk);
1917         if (sk->sk_state != IUCV_CLOSED) {
1918                 sk->sk_shutdown |= SEND_SHUTDOWN;
1919                 sk->sk_state_change(sk);
1920         }
1921         bh_unlock_sock(sk);
1922 }
1923
1924 /***************** HiperSockets transport callbacks ********************/
1925 static void afiucv_swap_src_dest(struct sk_buff *skb)
1926 {
1927         struct af_iucv_trans_hdr *trans_hdr =
1928                                 (struct af_iucv_trans_hdr *)skb->data;
1929         char tmpID[8];
1930         char tmpName[8];
1931
1932         ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1933         ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1934         ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1935         ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1936         memcpy(tmpID, trans_hdr->srcUserID, 8);
1937         memcpy(tmpName, trans_hdr->srcAppName, 8);
1938         memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1939         memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1940         memcpy(trans_hdr->destUserID, tmpID, 8);
1941         memcpy(trans_hdr->destAppName, tmpName, 8);
1942         skb_push(skb, ETH_HLEN);
1943         memset(skb->data, 0, ETH_HLEN);
1944 }
1945
1946 /**
1947  * afiucv_hs_callback_syn - react on received SYN
1948  **/
1949 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1950 {
1951         struct sock *nsk;
1952         struct iucv_sock *iucv, *niucv;
1953         struct af_iucv_trans_hdr *trans_hdr;
1954         int err;
1955
1956         iucv = iucv_sk(sk);
1957         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1958         if (!iucv) {
1959                 /* no sock - connection refused */
1960                 afiucv_swap_src_dest(skb);
1961                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1962                 err = dev_queue_xmit(skb);
1963                 goto out;
1964         }
1965
1966         nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1967         bh_lock_sock(sk);
1968         if ((sk->sk_state != IUCV_LISTEN) ||
1969             sk_acceptq_is_full(sk) ||
1970             !nsk) {
1971                 /* error on server socket - connection refused */
1972                 afiucv_swap_src_dest(skb);
1973                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1974                 err = dev_queue_xmit(skb);
1975                 iucv_sock_kill(nsk);
1976                 bh_unlock_sock(sk);
1977                 goto out;
1978         }
1979
1980         niucv = iucv_sk(nsk);
1981         iucv_sock_init(nsk, sk);
1982         niucv->transport = AF_IUCV_TRANS_HIPER;
1983         niucv->msglimit = iucv->msglimit;
1984         if (!trans_hdr->window)
1985                 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1986         else
1987                 niucv->msglimit_peer = trans_hdr->window;
1988         memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1989         memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1990         memcpy(niucv->src_name, iucv->src_name, 8);
1991         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1992         nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1993         niucv->hs_dev = iucv->hs_dev;
1994         dev_hold(niucv->hs_dev);
1995         afiucv_swap_src_dest(skb);
1996         trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1997         trans_hdr->window = niucv->msglimit;
1998         /* if receiver acks the xmit connection is established */
1999         err = dev_queue_xmit(skb);
2000         if (!err) {
2001                 iucv_accept_enqueue(sk, nsk);
2002                 nsk->sk_state = IUCV_CONNECTED;
2003                 sk->sk_data_ready(sk);
2004         } else
2005                 iucv_sock_kill(nsk);
2006         bh_unlock_sock(sk);
2007
2008 out:
2009         return NET_RX_SUCCESS;
2010 }
2011
2012 /**
2013  * afiucv_hs_callback_synack() - react on received SYN-ACK
2014  **/
2015 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2016 {
2017         struct iucv_sock *iucv = iucv_sk(sk);
2018         struct af_iucv_trans_hdr *trans_hdr =
2019                                         (struct af_iucv_trans_hdr *)skb->data;
2020
2021         if (!iucv)
2022                 goto out;
2023         if (sk->sk_state != IUCV_BOUND)
2024                 goto out;
2025         bh_lock_sock(sk);
2026         iucv->msglimit_peer = trans_hdr->window;
2027         sk->sk_state = IUCV_CONNECTED;
2028         sk->sk_state_change(sk);
2029         bh_unlock_sock(sk);
2030 out:
2031         kfree_skb(skb);
2032         return NET_RX_SUCCESS;
2033 }
2034
2035 /**
2036  * afiucv_hs_callback_synfin() - react on received SYN_FIN
2037  **/
2038 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2039 {
2040         struct iucv_sock *iucv = iucv_sk(sk);
2041
2042         if (!iucv)
2043                 goto out;
2044         if (sk->sk_state != IUCV_BOUND)
2045                 goto out;
2046         bh_lock_sock(sk);
2047         sk->sk_state = IUCV_DISCONN;
2048         sk->sk_state_change(sk);
2049         bh_unlock_sock(sk);
2050 out:
2051         kfree_skb(skb);
2052         return NET_RX_SUCCESS;
2053 }
2054
2055 /**
2056  * afiucv_hs_callback_fin() - react on received FIN
2057  **/
2058 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2059 {
2060         struct iucv_sock *iucv = iucv_sk(sk);
2061
2062         /* other end of connection closed */
2063         if (!iucv)
2064                 goto out;
2065         bh_lock_sock(sk);
2066         if (sk->sk_state == IUCV_CONNECTED) {
2067                 sk->sk_state = IUCV_DISCONN;
2068                 sk->sk_state_change(sk);
2069         }
2070         bh_unlock_sock(sk);
2071 out:
2072         kfree_skb(skb);
2073         return NET_RX_SUCCESS;
2074 }
2075
2076 /**
2077  * afiucv_hs_callback_win() - react on received WIN
2078  **/
2079 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2080 {
2081         struct iucv_sock *iucv = iucv_sk(sk);
2082         struct af_iucv_trans_hdr *trans_hdr =
2083                                         (struct af_iucv_trans_hdr *)skb->data;
2084
2085         if (!iucv)
2086                 return NET_RX_SUCCESS;
2087
2088         if (sk->sk_state != IUCV_CONNECTED)
2089                 return NET_RX_SUCCESS;
2090
2091         atomic_sub(trans_hdr->window, &iucv->msg_sent);
2092         iucv_sock_wake_msglim(sk);
2093         return NET_RX_SUCCESS;
2094 }
2095
2096 /**
2097  * afiucv_hs_callback_rx() - react on received data
2098  **/
2099 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2100 {
2101         struct iucv_sock *iucv = iucv_sk(sk);
2102
2103         if (!iucv) {
2104                 kfree_skb(skb);
2105                 return NET_RX_SUCCESS;
2106         }
2107
2108         if (sk->sk_state != IUCV_CONNECTED) {
2109                 kfree_skb(skb);
2110                 return NET_RX_SUCCESS;
2111         }
2112
2113         if (sk->sk_shutdown & RCV_SHUTDOWN) {
2114                 kfree_skb(skb);
2115                 return NET_RX_SUCCESS;
2116         }
2117
2118         /* write stuff from iucv_msg to skb cb */
2119         skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2120         skb_reset_transport_header(skb);
2121         skb_reset_network_header(skb);
2122         IUCV_SKB_CB(skb)->offset = 0;
2123         spin_lock(&iucv->message_q.lock);
2124         if (skb_queue_empty(&iucv->backlog_skb_q)) {
2125                 if (sock_queue_rcv_skb(sk, skb)) {
2126                         /* handle rcv queue full */
2127                         skb_queue_tail(&iucv->backlog_skb_q, skb);
2128                 }
2129         } else
2130                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2131         spin_unlock(&iucv->message_q.lock);
2132         return NET_RX_SUCCESS;
2133 }
2134
2135 /**
2136  * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2137  *                   transport
2138  *                   called from netif RX softirq
2139  **/
2140 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2141         struct packet_type *pt, struct net_device *orig_dev)
2142 {
2143         struct sock *sk;
2144         struct iucv_sock *iucv;
2145         struct af_iucv_trans_hdr *trans_hdr;
2146         char nullstring[8];
2147         int err = 0;
2148
2149         if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2150                 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2151                           (int)skb->len,
2152                           (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2153                 kfree_skb(skb);
2154                 return NET_RX_SUCCESS;
2155         }
2156         if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2157                 if (skb_linearize(skb)) {
2158                         WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2159                                   (int)skb->len);
2160                         kfree_skb(skb);
2161                         return NET_RX_SUCCESS;
2162                 }
2163         skb_pull(skb, ETH_HLEN);
2164         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2165         EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2166         EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2167         EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2168         EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2169         memset(nullstring, 0, sizeof(nullstring));
2170         iucv = NULL;
2171         sk = NULL;
2172         read_lock(&iucv_sk_list.lock);
2173         sk_for_each(sk, &iucv_sk_list.head) {
2174                 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2175                         if ((!memcmp(&iucv_sk(sk)->src_name,
2176                                      trans_hdr->destAppName, 8)) &&
2177                             (!memcmp(&iucv_sk(sk)->src_user_id,
2178                                      trans_hdr->destUserID, 8)) &&
2179                             (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2180                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2181                                      nullstring, 8))) {
2182                                 iucv = iucv_sk(sk);
2183                                 break;
2184                         }
2185                 } else {
2186                         if ((!memcmp(&iucv_sk(sk)->src_name,
2187                                      trans_hdr->destAppName, 8)) &&
2188                             (!memcmp(&iucv_sk(sk)->src_user_id,
2189                                      trans_hdr->destUserID, 8)) &&
2190                             (!memcmp(&iucv_sk(sk)->dst_name,
2191                                      trans_hdr->srcAppName, 8)) &&
2192                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2193                                      trans_hdr->srcUserID, 8))) {
2194                                 iucv = iucv_sk(sk);
2195                                 break;
2196                         }
2197                 }
2198         }
2199         read_unlock(&iucv_sk_list.lock);
2200         if (!iucv)
2201                 sk = NULL;
2202
2203         /* no sock
2204         how should we send with no sock
2205         1) send without sock no send rc checking?
2206         2) introduce default sock to handle this cases
2207
2208          SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2209          data -> send FIN
2210          SYN|ACK, SYN|FIN, FIN -> no action? */
2211
2212         switch (trans_hdr->flags) {
2213         case AF_IUCV_FLAG_SYN:
2214                 /* connect request */
2215                 err = afiucv_hs_callback_syn(sk, skb);
2216                 break;
2217         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2218                 /* connect request confirmed */
2219                 err = afiucv_hs_callback_synack(sk, skb);
2220                 break;
2221         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2222                 /* connect request refused */
2223                 err = afiucv_hs_callback_synfin(sk, skb);
2224                 break;
2225         case (AF_IUCV_FLAG_FIN):
2226                 /* close request */
2227                 err = afiucv_hs_callback_fin(sk, skb);
2228                 break;
2229         case (AF_IUCV_FLAG_WIN):
2230                 err = afiucv_hs_callback_win(sk, skb);
2231                 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2232                         kfree_skb(skb);
2233                         break;
2234                 }
2235                 /* fall through and receive non-zero length data */
2236         case (AF_IUCV_FLAG_SHT):
2237                 /* shutdown request */
2238                 /* fall through and receive zero length data */
2239         case 0:
2240                 /* plain data frame */
2241                 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2242                 err = afiucv_hs_callback_rx(sk, skb);
2243                 break;
2244         default:
2245                 ;
2246         }
2247
2248         return err;
2249 }
2250
2251 /**
2252  * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2253  *                                 transport
2254  **/
2255 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2256                                         enum iucv_tx_notify n)
2257 {
2258         struct sock *isk = skb->sk;
2259         struct sock *sk = NULL;
2260         struct iucv_sock *iucv = NULL;
2261         struct sk_buff_head *list;
2262         struct sk_buff *list_skb;
2263         struct sk_buff *nskb;
2264         unsigned long flags;
2265
2266         read_lock_irqsave(&iucv_sk_list.lock, flags);
2267         sk_for_each(sk, &iucv_sk_list.head)
2268                 if (sk == isk) {
2269                         iucv = iucv_sk(sk);
2270                         break;
2271                 }
2272         read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2273
2274         if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2275                 return;
2276
2277         list = &iucv->send_skb_q;
2278         spin_lock_irqsave(&list->lock, flags);
2279         if (skb_queue_empty(list))
2280                 goto out_unlock;
2281         list_skb = list->next;
2282         nskb = list_skb->next;
2283         while (list_skb != (struct sk_buff *)list) {
2284                 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2285                         switch (n) {
2286                         case TX_NOTIFY_OK:
2287                                 __skb_unlink(list_skb, list);
2288                                 kfree_skb(list_skb);
2289                                 iucv_sock_wake_msglim(sk);
2290                                 break;
2291                         case TX_NOTIFY_PENDING:
2292                                 atomic_inc(&iucv->pendings);
2293                                 break;
2294                         case TX_NOTIFY_DELAYED_OK:
2295                                 __skb_unlink(list_skb, list);
2296                                 atomic_dec(&iucv->pendings);
2297                                 if (atomic_read(&iucv->pendings) <= 0)
2298                                         iucv_sock_wake_msglim(sk);
2299                                 kfree_skb(list_skb);
2300                                 break;
2301                         case TX_NOTIFY_UNREACHABLE:
2302                         case TX_NOTIFY_DELAYED_UNREACHABLE:
2303                         case TX_NOTIFY_TPQFULL: /* not yet used */
2304                         case TX_NOTIFY_GENERALERROR:
2305                         case TX_NOTIFY_DELAYED_GENERALERROR:
2306                                 __skb_unlink(list_skb, list);
2307                                 kfree_skb(list_skb);
2308                                 if (sk->sk_state == IUCV_CONNECTED) {
2309                                         sk->sk_state = IUCV_DISCONN;
2310                                         sk->sk_state_change(sk);
2311                                 }
2312                                 break;
2313                         }
2314                         break;
2315                 }
2316                 list_skb = nskb;
2317                 nskb = nskb->next;
2318         }
2319 out_unlock:
2320         spin_unlock_irqrestore(&list->lock, flags);
2321
2322         if (sk->sk_state == IUCV_CLOSING) {
2323                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2324                         sk->sk_state = IUCV_CLOSED;
2325                         sk->sk_state_change(sk);
2326                 }
2327         }
2328
2329 }
2330
2331 /*
2332  * afiucv_netdev_event: handle netdev notifier chain events
2333  */
2334 static int afiucv_netdev_event(struct notifier_block *this,
2335                                unsigned long event, void *ptr)
2336 {
2337         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2338         struct sock *sk;
2339         struct iucv_sock *iucv;
2340
2341         switch (event) {
2342         case NETDEV_REBOOT:
2343         case NETDEV_GOING_DOWN:
2344                 sk_for_each(sk, &iucv_sk_list.head) {
2345                         iucv = iucv_sk(sk);
2346                         if ((iucv->hs_dev == event_dev) &&
2347                             (sk->sk_state == IUCV_CONNECTED)) {
2348                                 if (event == NETDEV_GOING_DOWN)
2349                                         iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2350                                 sk->sk_state = IUCV_DISCONN;
2351                                 sk->sk_state_change(sk);
2352                         }
2353                 }
2354                 break;
2355         case NETDEV_DOWN:
2356         case NETDEV_UNREGISTER:
2357         default:
2358                 break;
2359         }
2360         return NOTIFY_DONE;
2361 }
2362
2363 static struct notifier_block afiucv_netdev_notifier = {
2364         .notifier_call = afiucv_netdev_event,
2365 };
2366
2367 static const struct proto_ops iucv_sock_ops = {
2368         .family         = PF_IUCV,
2369         .owner          = THIS_MODULE,
2370         .release        = iucv_sock_release,
2371         .bind           = iucv_sock_bind,
2372         .connect        = iucv_sock_connect,
2373         .listen         = iucv_sock_listen,
2374         .accept         = iucv_sock_accept,
2375         .getname        = iucv_sock_getname,
2376         .sendmsg        = iucv_sock_sendmsg,
2377         .recvmsg        = iucv_sock_recvmsg,
2378         .poll           = iucv_sock_poll,
2379         .ioctl          = sock_no_ioctl,
2380         .mmap           = sock_no_mmap,
2381         .socketpair     = sock_no_socketpair,
2382         .shutdown       = iucv_sock_shutdown,
2383         .setsockopt     = iucv_sock_setsockopt,
2384         .getsockopt     = iucv_sock_getsockopt,
2385 };
2386
2387 static const struct net_proto_family iucv_sock_family_ops = {
2388         .family = AF_IUCV,
2389         .owner  = THIS_MODULE,
2390         .create = iucv_sock_create,
2391 };
2392
2393 static struct packet_type iucv_packet_type = {
2394         .type = cpu_to_be16(ETH_P_AF_IUCV),
2395         .func = afiucv_hs_rcv,
2396 };
2397
2398 static int afiucv_iucv_init(void)
2399 {
2400         int err;
2401
2402         err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2403         if (err)
2404                 goto out;
2405         /* establish dummy device */
2406         af_iucv_driver.bus = pr_iucv->bus;
2407         err = driver_register(&af_iucv_driver);
2408         if (err)
2409                 goto out_iucv;
2410         af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2411         if (!af_iucv_dev) {
2412                 err = -ENOMEM;
2413                 goto out_driver;
2414         }
2415         dev_set_name(af_iucv_dev, "af_iucv");
2416         af_iucv_dev->bus = pr_iucv->bus;
2417         af_iucv_dev->parent = pr_iucv->root;
2418         af_iucv_dev->release = (void (*)(struct device *))kfree;
2419         af_iucv_dev->driver = &af_iucv_driver;
2420         err = device_register(af_iucv_dev);
2421         if (err)
2422                 goto out_iucv_dev;
2423         return 0;
2424
2425 out_iucv_dev:
2426         put_device(af_iucv_dev);
2427 out_driver:
2428         driver_unregister(&af_iucv_driver);
2429 out_iucv:
2430         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2431 out:
2432         return err;
2433 }
2434
2435 static void afiucv_iucv_exit(void)
2436 {
2437         device_unregister(af_iucv_dev);
2438         driver_unregister(&af_iucv_driver);
2439         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2440 }
2441
2442 static int __init afiucv_init(void)
2443 {
2444         int err;
2445
2446         if (MACHINE_IS_VM) {
2447                 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2448                 if (unlikely(err)) {
2449                         WARN_ON(err);
2450                         err = -EPROTONOSUPPORT;
2451                         goto out;
2452                 }
2453
2454                 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2455                 if (!pr_iucv) {
2456                         printk(KERN_WARNING "iucv_if lookup failed\n");
2457                         memset(&iucv_userid, 0, sizeof(iucv_userid));
2458                 }
2459         } else {
2460                 memset(&iucv_userid, 0, sizeof(iucv_userid));
2461                 pr_iucv = NULL;
2462         }
2463
2464         err = proto_register(&iucv_proto, 0);
2465         if (err)
2466                 goto out;
2467         err = sock_register(&iucv_sock_family_ops);
2468         if (err)
2469                 goto out_proto;
2470
2471         if (pr_iucv) {
2472                 err = afiucv_iucv_init();
2473                 if (err)
2474                         goto out_sock;
2475         }
2476
2477         err = register_netdevice_notifier(&afiucv_netdev_notifier);
2478         if (err)
2479                 goto out_notifier;
2480
2481         dev_add_pack(&iucv_packet_type);
2482         return 0;
2483
2484 out_notifier:
2485         if (pr_iucv)
2486                 afiucv_iucv_exit();
2487 out_sock:
2488         sock_unregister(PF_IUCV);
2489 out_proto:
2490         proto_unregister(&iucv_proto);
2491 out:
2492         if (pr_iucv)
2493                 symbol_put(iucv_if);
2494         return err;
2495 }
2496
2497 static void __exit afiucv_exit(void)
2498 {
2499         if (pr_iucv) {
2500                 afiucv_iucv_exit();
2501                 symbol_put(iucv_if);
2502         }
2503
2504         unregister_netdevice_notifier(&afiucv_netdev_notifier);
2505         dev_remove_pack(&iucv_packet_type);
2506         sock_unregister(PF_IUCV);
2507         proto_unregister(&iucv_proto);
2508 }
2509
2510 module_init(afiucv_init);
2511 module_exit(afiucv_exit);
2512
2513 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2514 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2515 MODULE_VERSION(VERSION);
2516 MODULE_LICENSE("GPL");
2517 MODULE_ALIAS_NETPROTO(PF_IUCV);
2518