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   1 /*
   2  *  linux/net/iucv/af_iucv.c
   3  *
   4  *  IUCV protocol stack for Linux on zSeries
   5  *
   6  *  Copyright 2006 IBM Corporation
   7  *
   8  *  Author(s):  Jennifer Hunt <jenhunt@us.ibm.com>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/list.h>
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/init.h>
  20 #include <linux/poll.h>
  21 #include <net/sock.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/cpcmd.h>
  24 #include <linux/kmod.h>
  25
  26 #include <net/iucv/iucv.h>
  27 #include <net/iucv/af_iucv.h>
  28
  29 #define CONFIG_IUCV_SOCK_DEBUG 1
  30
  31 #define IPRMDATA 0x80
  32 #define VERSION "1.0"
  33
  34 static char iucv_userid[80];
  35
  36 static struct proto_ops iucv_sock_ops;
  37
  38 static struct proto iucv_proto = {
  39         .name           = "AF_IUCV",
  40         .owner          = THIS_MODULE,
  41         .obj_size       = sizeof(struct iucv_sock),
  42 };
  43
  44 static void iucv_sock_kill(struct sock *sk);
  45 static void iucv_sock_close(struct sock *sk);
  46
  47 /* Call Back functions */
  48 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  49 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
  50 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
  51 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
  52                                  u8 ipuser[16]);
  53 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
  54
  55 static struct iucv_sock_list iucv_sk_list = {
  56         .lock = RW_LOCK_UNLOCKED,
  57         .autobind_name = ATOMIC_INIT(0)
  58 };
  59
  60 static struct iucv_handler af_iucv_handler = {
  61         .path_pending     = iucv_callback_connreq,
  62         .path_complete    = iucv_callback_connack,
  63         .path_severed     = iucv_callback_connrej,
  64         .message_pending  = iucv_callback_rx,
  65         .message_complete = iucv_callback_txdone
  66 };
  67
  68 static inline void high_nmcpy(unsigned char *dst, char *src)
  69 {
  70        memcpy(dst, src, 8);
  71 }
  72
  73 static inline void low_nmcpy(unsigned char *dst, char *src)
  74 {
  75        memcpy(&dst[8], src, 8);
  76 }
  77
  78 /* Timers */
  79 static void iucv_sock_timeout(unsigned long arg)
  80 {
  81         struct sock *sk = (struct sock *)arg;
  82
  83         bh_lock_sock(sk);
  84         sk->sk_err = ETIMEDOUT;
  85         sk->sk_state_change(sk);
  86         bh_unlock_sock(sk);
  87
  88         iucv_sock_kill(sk);
  89         sock_put(sk);
  90 }
  91
  92 static void iucv_sock_clear_timer(struct sock *sk)
  93 {
  94         sk_stop_timer(sk, &sk->sk_timer);
  95 }
  96
  97 static struct sock *__iucv_get_sock_by_name(char *nm)
  98 {
  99         struct sock *sk;
 100         struct hlist_node *node;
 101
 102         sk_for_each(sk, node, &iucv_sk_list.head)
 103                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 104                         return sk;
 105
 106         return NULL;
 107 }
 108
 109 static void iucv_sock_destruct(struct sock *sk)
 110 {
 111         skb_queue_purge(&sk->sk_receive_queue);
 112         skb_queue_purge(&sk->sk_write_queue);
 113 }
 114
 115 /* Cleanup Listen */
 116 static void iucv_sock_cleanup_listen(struct sock *parent)
 117 {
 118         struct sock *sk;
 119
 120         /* Close non-accepted connections */
 121         while ((sk = iucv_accept_dequeue(parent, NULL))) {
 122                 iucv_sock_close(sk);
 123                 iucv_sock_kill(sk);
 124         }
 125
 126         parent->sk_state = IUCV_CLOSED;
 127         sock_set_flag(parent, SOCK_ZAPPED);
 128 }
 129
 130 /* Kill socket */
 131 static void iucv_sock_kill(struct sock *sk)
 132 {
 133         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 134                 return;
 135
 136         iucv_sock_unlink(&iucv_sk_list, sk);
 137         sock_set_flag(sk, SOCK_DEAD);
 138         sock_put(sk);
 139 }
 140
 141 /* Close an IUCV socket */
 142 static void iucv_sock_close(struct sock *sk)
 143 {
 144         unsigned char user_data[16];
 145         struct iucv_sock *iucv = iucv_sk(sk);
 146         int err;
 147         unsigned long timeo;
 148
 149         iucv_sock_clear_timer(sk);
 150         lock_sock(sk);
 151
 152         switch (sk->sk_state) {
 153         case IUCV_LISTEN:
 154                 iucv_sock_cleanup_listen(sk);
 155                 break;
 156
 157         case IUCV_CONNECTED:
 158         case IUCV_DISCONN:
 159                 err = 0;
 160
 161                 sk->sk_state = IUCV_CLOSING;
 162                 sk->sk_state_change(sk);
 163
 164                 if (!skb_queue_empty(&iucv->send_skb_q)) {
 165                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 166                                 timeo = sk->sk_lingertime;
 167                         else
 168                                 timeo = IUCV_DISCONN_TIMEOUT;
 169                         err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo);
 170                 }
 171
 172                 sk->sk_state = IUCV_CLOSED;
 173                 sk->sk_state_change(sk);
 174
 175                 if (iucv->path) {
 176                         low_nmcpy(user_data, iucv->src_name);
 177                         high_nmcpy(user_data, iucv->dst_name);
 178                         ASCEBC(user_data, sizeof(user_data));
 179                         err = iucv_path_sever(iucv->path, user_data);
 180                         iucv_path_free(iucv->path);
 181                         iucv->path = NULL;
 182                 }
 183
 184                 sk->sk_err = ECONNRESET;
 185                 sk->sk_state_change(sk);
 186
 187                 skb_queue_purge(&iucv->send_skb_q);
 188                 skb_queue_purge(&iucv->backlog_skb_q);
 189
 190                 sock_set_flag(sk, SOCK_ZAPPED);
 191                 break;
 192
 193         default:
 194                 sock_set_flag(sk, SOCK_ZAPPED);
 195                 break;
 196         }
 197
 198         release_sock(sk);
 199         iucv_sock_kill(sk);
 200 }
 201
 202 static void iucv_sock_init(struct sock *sk, struct sock *parent)
 203 {
 204         if (parent)
 205                 sk->sk_type = parent->sk_type;
 206 }
 207
 208 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
 209 {
 210         struct sock *sk;
 211
 212         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
 213         if (!sk)
 214                 return NULL;
 215
 216         sock_init_data(sock, sk);
 217         INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
 218         spin_lock_init(&iucv_sk(sk)->accept_q_lock);
 219         skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
 220         INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
 221         spin_lock_init(&iucv_sk(sk)->message_q.lock);
 222         skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
 223         iucv_sk(sk)->send_tag = 0;
 224
 225         sk->sk_destruct = iucv_sock_destruct;
 226         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 227         sk->sk_allocation = GFP_DMA;
 228
 229         sock_reset_flag(sk, SOCK_ZAPPED);
 230
 231         sk->sk_protocol = proto;
 232         sk->sk_state    = IUCV_OPEN;
 233
 234         setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
 235
 236         iucv_sock_link(&iucv_sk_list, sk);
 237         return sk;
 238 }
 239
 240 /* Create an IUCV socket */
 241 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
 242 {
 243         struct sock *sk;
 244
 245         if (sock->type != SOCK_STREAM)
 246                 return -ESOCKTNOSUPPORT;
 247
 248         sock->state = SS_UNCONNECTED;
 249         sock->ops = &iucv_sock_ops;
 250
 251         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
 252         if (!sk)
 253                 return -ENOMEM;
 254
 255         iucv_sock_init(sk, NULL);
 256
 257         return 0;
 258 }
 259
 260 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 261 {
 262         write_lock_bh(&l->lock);
 263         sk_add_node(sk, &l->head);
 264         write_unlock_bh(&l->lock);
 265 }
 266
 267 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 268 {
 269         write_lock_bh(&l->lock);
 270         sk_del_node_init(sk);
 271         write_unlock_bh(&l->lock);
 272 }
 273
 274 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 275 {
 276         unsigned long flags;
 277         struct iucv_sock *par = iucv_sk(parent);
 278
 279         sock_hold(sk);
 280         spin_lock_irqsave(&par->accept_q_lock, flags);
 281         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 282         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 283         iucv_sk(sk)->parent = parent;
 284         parent->sk_ack_backlog++;
 285 }
 286
 287 void iucv_accept_unlink(struct sock *sk)
 288 {
 289         unsigned long flags;
 290         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 291
 292         spin_lock_irqsave(&par->accept_q_lock, flags);
 293         list_del_init(&iucv_sk(sk)->accept_q);
 294         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 295         iucv_sk(sk)->parent->sk_ack_backlog--;
 296         iucv_sk(sk)->parent = NULL;
 297         sock_put(sk);
 298 }
 299
 300 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 301 {
 302         struct iucv_sock *isk, *n;
 303         struct sock *sk;
 304
 305         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 306                 sk = (struct sock *) isk;
 307                 lock_sock(sk);
 308
 309                 if (sk->sk_state == IUCV_CLOSED) {
 310                         iucv_accept_unlink(sk);
 311                         release_sock(sk);
 312                         continue;
 313                 }
 314
 315                 if (sk->sk_state == IUCV_CONNECTED ||
 316                     sk->sk_state == IUCV_SEVERED ||
 317                     !newsock) {
 318                         iucv_accept_unlink(sk);
 319                         if (newsock)
 320                                 sock_graft(sk, newsock);
 321
 322                         if (sk->sk_state == IUCV_SEVERED)
 323                                 sk->sk_state = IUCV_DISCONN;
 324
 325                         release_sock(sk);
 326                         return sk;
 327                 }
 328
 329                 release_sock(sk);
 330         }
 331         return NULL;
 332 }
 333
 334 int iucv_sock_wait_state(struct sock *sk, int state, int state2,
 335                          unsigned long timeo)
 336 {
 337         DECLARE_WAITQUEUE(wait, current);
 338         int err = 0;
 339
 340         add_wait_queue(sk->sk_sleep, &wait);
 341         while (sk->sk_state != state && sk->sk_state != state2) {
 342                 set_current_state(TASK_INTERRUPTIBLE);
 343
 344                 if (!timeo) {
 345                         err = -EAGAIN;
 346                         break;
 347                 }
 348
 349                 if (signal_pending(current)) {
 350                         err = sock_intr_errno(timeo);
 351                         break;
 352                 }
 353
 354                 release_sock(sk);
 355                 timeo = schedule_timeout(timeo);
 356                 lock_sock(sk);
 357
 358                 err = sock_error(sk);
 359                 if (err)
 360                         break;
 361         }
 362         set_current_state(TASK_RUNNING);
 363         remove_wait_queue(sk->sk_sleep, &wait);
 364         return err;
 365 }
 366
 367 /* Bind an unbound socket */
 368 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 369                           int addr_len)
 370 {
 371         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 372         struct sock *sk = sock->sk;
 373         struct iucv_sock *iucv;
 374         int err;
 375
 376         /* Verify the input sockaddr */
 377         if (!addr || addr->sa_family != AF_IUCV)
 378                 return -EINVAL;
 379
 380         lock_sock(sk);
 381         if (sk->sk_state != IUCV_OPEN) {
 382                 err = -EBADFD;
 383                 goto done;
 384         }
 385
 386         write_lock_bh(&iucv_sk_list.lock);
 387
 388         iucv = iucv_sk(sk);
 389         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 390                 err = -EADDRINUSE;
 391                 goto done_unlock;
 392         }
 393         if (iucv->path) {
 394                 err = 0;
 395                 goto done_unlock;
 396         }
 397
 398         /* Bind the socket */
 399         memcpy(iucv->src_name, sa->siucv_name, 8);
 400
 401         /* Copy the user id */
 402         memcpy(iucv->src_user_id, iucv_userid, 8);
 403         sk->sk_state = IUCV_BOUND;
 404         err = 0;
 405
 406 done_unlock:
 407         /* Release the socket list lock */
 408         write_unlock_bh(&iucv_sk_list.lock);
 409 done:
 410         release_sock(sk);
 411         return err;
 412 }
 413
 414 /* Automatically bind an unbound socket */
 415 static int iucv_sock_autobind(struct sock *sk)
 416 {
 417         struct iucv_sock *iucv = iucv_sk(sk);
 418         char query_buffer[80];
 419         char name[12];
 420         int err = 0;
 421
 422         /* Set the userid and name */
 423         cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
 424         if (unlikely(err))
 425                 return -EPROTO;
 426
 427         memcpy(iucv->src_user_id, query_buffer, 8);
 428
 429         write_lock_bh(&iucv_sk_list.lock);
 430
 431         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 432         while (__iucv_get_sock_by_name(name)) {
 433                 sprintf(name, "%08x",
 434                         atomic_inc_return(&iucv_sk_list.autobind_name));
 435         }
 436
 437         write_unlock_bh(&iucv_sk_list.lock);
 438
 439         memcpy(&iucv->src_name, name, 8);
 440
 441         return err;
 442 }
 443
 444 /* Connect an unconnected socket */
 445 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 446                              int alen, int flags)
 447 {
 448         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 449         struct sock *sk = sock->sk;
 450         struct iucv_sock *iucv;
 451         unsigned char user_data[16];
 452         int err;
 453
 454         if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
 455                 return -EINVAL;
 456
 457         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 458                 return -EBADFD;
 459
 460         if (sk->sk_type != SOCK_STREAM)
 461                 return -EINVAL;
 462
 463         iucv = iucv_sk(sk);
 464
 465         if (sk->sk_state == IUCV_OPEN) {
 466                 err = iucv_sock_autobind(sk);
 467                 if (unlikely(err))
 468                         return err;
 469         }
 470
 471         lock_sock(sk);
 472
 473         /* Set the destination information */
 474         memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
 475         memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
 476
 477         high_nmcpy(user_data, sa->siucv_name);
 478         low_nmcpy(user_data, iucv_sk(sk)->src_name);
 479         ASCEBC(user_data, sizeof(user_data));
 480
 481         iucv = iucv_sk(sk);
 482         /* Create path. */
 483         iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
 484                                      IPRMDATA, GFP_KERNEL);
 485         err = iucv_path_connect(iucv->path, &af_iucv_handler,
 486                                 sa->siucv_user_id, NULL, user_data, sk);
 487         if (err) {
 488                 iucv_path_free(iucv->path);
 489                 iucv->path = NULL;
 490                 err = -ECONNREFUSED;
 491                 goto done;
 492         }
 493
 494         if (sk->sk_state != IUCV_CONNECTED) {
 495                 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
 496                                 sock_sndtimeo(sk, flags & O_NONBLOCK));
 497         }
 498
 499         if (sk->sk_state == IUCV_DISCONN) {
 500                 release_sock(sk);
 501                 return -ECONNREFUSED;
 502         }
 503 done:
 504         release_sock(sk);
 505         return err;
 506 }
 507
 508 /* Move a socket into listening state. */
 509 static int iucv_sock_listen(struct socket *sock, int backlog)
 510 {
 511         struct sock *sk = sock->sk;
 512         int err;
 513
 514         lock_sock(sk);
 515
 516         err = -EINVAL;
 517         if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM)
 518                 goto done;
 519
 520         sk->sk_max_ack_backlog = backlog;
 521         sk->sk_ack_backlog = 0;
 522         sk->sk_state = IUCV_LISTEN;
 523         err = 0;
 524
 525 done:
 526         release_sock(sk);
 527         return err;
 528 }
 529
 530 /* Accept a pending connection */
 531 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 532                             int flags)
 533 {
 534         DECLARE_WAITQUEUE(wait, current);
 535         struct sock *sk = sock->sk, *nsk;
 536         long timeo;
 537         int err = 0;
 538
 539         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 540
 541         if (sk->sk_state != IUCV_LISTEN) {
 542                 err = -EBADFD;
 543                 goto done;
 544         }
 545
 546         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 547
 548         /* Wait for an incoming connection */
 549         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 550         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 551                 set_current_state(TASK_INTERRUPTIBLE);
 552                 if (!timeo) {
 553                         err = -EAGAIN;
 554                         break;
 555                 }
 556
 557                 release_sock(sk);
 558                 timeo = schedule_timeout(timeo);
 559                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 560
 561                 if (sk->sk_state != IUCV_LISTEN) {
 562                         err = -EBADFD;
 563                         break;
 564                 }
 565
 566                 if (signal_pending(current)) {
 567                         err = sock_intr_errno(timeo);
 568                         break;
 569                 }
 570         }
 571
 572         set_current_state(TASK_RUNNING);
 573         remove_wait_queue(sk->sk_sleep, &wait);
 574
 575         if (err)
 576                 goto done;
 577
 578         newsock->state = SS_CONNECTED;
 579
 580 done:
 581         release_sock(sk);
 582         return err;
 583 }
 584
 585 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 586                              int *len, int peer)
 587 {
 588         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 589         struct sock *sk = sock->sk;
 590
 591         addr->sa_family = AF_IUCV;
 592         *len = sizeof(struct sockaddr_iucv);
 593
 594         if (peer) {
 595                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
 596                 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
 597         } else {
 598                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
 599                 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
 600         }
 601         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
 602         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
 603         memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
 604
 605         return 0;
 606 }
 607
 608 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 609                              struct msghdr *msg, size_t len)
 610 {
 611         struct sock *sk = sock->sk;
 612         struct iucv_sock *iucv = iucv_sk(sk);
 613         struct sk_buff *skb;
 614         struct iucv_message txmsg;
 615         int err;
 616
 617         err = sock_error(sk);
 618         if (err)
 619                 return err;
 620
 621         if (msg->msg_flags & MSG_OOB)
 622                 return -EOPNOTSUPP;
 623
 624         lock_sock(sk);
 625
 626         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 627                 err = -EPIPE;
 628                 goto out;
 629         }
 630
 631         if (sk->sk_state == IUCV_CONNECTED) {
 632                 if (!(skb = sock_alloc_send_skb(sk, len,
 633                                                 msg->msg_flags & MSG_DONTWAIT,
 634                                                 &err)))
 635                         goto out;
 636
 637                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 638                         err = -EFAULT;
 639                         goto fail;
 640                 }
 641
 642                 txmsg.class = 0;
 643                 txmsg.tag = iucv->send_tag++;
 644                 memcpy(skb->cb, &txmsg.tag, 4);
 645                 skb_queue_tail(&iucv->send_skb_q, skb);
 646                 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
 647                                         (void *) skb->data, skb->len);
 648                 if (err) {
 649                         if (err == 3)
 650                                 printk(KERN_ERR "AF_IUCV msg limit exceeded\n");
 651                         skb_unlink(skb, &iucv->send_skb_q);
 652                         err = -EPIPE;
 653                         goto fail;
 654                 }
 655
 656         } else {
 657                 err = -ENOTCONN;
 658                 goto out;
 659         }
 660
 661         release_sock(sk);
 662         return len;
 663
 664 fail:
 665         kfree_skb(skb);
 666 out:
 667         release_sock(sk);
 668         return err;
 669 }
 670
 671 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
 672 {
 673         int dataleft, size, copied = 0;
 674         struct sk_buff *nskb;
 675
 676         dataleft = len;
 677         while (dataleft) {
 678                 if (dataleft >= sk->sk_rcvbuf / 4)
 679                         size = sk->sk_rcvbuf / 4;
 680                 else
 681                         size = dataleft;
 682
 683                 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
 684                 if (!nskb)
 685                         return -ENOMEM;
 686
 687                 memcpy(nskb->data, skb->data + copied, size);
 688                 copied += size;
 689                 dataleft -= size;
 690
 691                 skb_reset_transport_header(nskb);
 692                 skb_reset_network_header(nskb);
 693                 nskb->len = size;
 694
 695                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
 696         }
 697
 698         return 0;
 699 }
 700
 701 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
 702                                  struct iucv_path *path,
 703                                  struct iucv_message *msg)
 704 {
 705         int rc;
 706
 707         if (msg->flags & IPRMDATA) {
 708                 skb->data = NULL;
 709                 skb->len = 0;
 710         } else {
 711                 rc = iucv_message_receive(path, msg, 0, skb->data,
 712                                           msg->length, NULL);
 713                 if (rc) {
 714                         kfree_skb(skb);
 715                         return;
 716                 }
 717                 if (skb->truesize >= sk->sk_rcvbuf / 4) {
 718                         rc = iucv_fragment_skb(sk, skb, msg->length);
 719                         kfree_skb(skb);
 720                         skb = NULL;
 721                         if (rc) {
 722                                 iucv_path_sever(path, NULL);
 723                                 return;
 724                         }
 725                         skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
 726                 } else {
 727                         skb_reset_transport_header(skb);
 728                         skb_reset_network_header(skb);
 729                         skb->len = msg->length;
 730                 }
 731         }
 732
 733         if (sock_queue_rcv_skb(sk, skb))
 734                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
 735 }
 736
 737 static void iucv_process_message_q(struct sock *sk)
 738 {
 739         struct iucv_sock *iucv = iucv_sk(sk);
 740         struct sk_buff *skb;
 741         struct sock_msg_q *p, *n;
 742
 743         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
 744                 skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA);
 745                 if (!skb)
 746                         break;
 747                 iucv_process_message(sk, skb, p->path, &p->msg);
 748                 list_del(&p->list);
 749                 kfree(p);
 750                 if (!skb_queue_empty(&iucv->backlog_skb_q))
 751                         break;
 752         }
 753 }
 754
 755 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 756                              struct msghdr *msg, size_t len, int flags)
 757 {
 758         int noblock = flags & MSG_DONTWAIT;
 759         struct sock *sk = sock->sk;
 760         struct iucv_sock *iucv = iucv_sk(sk);
 761         int target, copied = 0;
 762         struct sk_buff *skb, *rskb, *cskb;
 763         int err = 0;
 764
 765         if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
 766             skb_queue_empty(&iucv->backlog_skb_q) &&
 767             skb_queue_empty(&sk->sk_receive_queue) &&
 768             list_empty(&iucv->message_q.list))
 769                 return 0;
 770
 771         if (flags & (MSG_OOB))
 772                 return -EOPNOTSUPP;
 773
 774         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
 775
 776         skb = skb_recv_datagram(sk, flags, noblock, &err);
 777         if (!skb) {
 778                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 779                         return 0;
 780                 return err;
 781         }
 782
 783         copied = min_t(unsigned int, skb->len, len);
 784
 785         cskb = skb;
 786         if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
 787                 skb_queue_head(&sk->sk_receive_queue, skb);
 788                 if (copied == 0)
 789                         return -EFAULT;
 790                 goto done;
 791         }
 792
 793         len -= copied;
 794
 795         /* Mark read part of skb as used */
 796         if (!(flags & MSG_PEEK)) {
 797                 skb_pull(skb, copied);
 798
 799                 if (skb->len) {
 800                         skb_queue_head(&sk->sk_receive_queue, skb);
 801                         goto done;
 802                 }
 803
 804                 kfree_skb(skb);
 805
 806                 /* Queue backlog skbs */
 807                 rskb = skb_dequeue(&iucv->backlog_skb_q);
 808                 while (rskb) {
 809                         if (sock_queue_rcv_skb(sk, rskb)) {
 810                                 skb_queue_head(&iucv->backlog_skb_q,
 811                                                 rskb);
 812                                 break;
 813                         } else {
 814                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
 815                         }
 816                 }
 817                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
 818                         spin_lock_bh(&iucv->message_q.lock);
 819                         if (!list_empty(&iucv->message_q.list))
 820                                 iucv_process_message_q(sk);
 821                         spin_unlock_bh(&iucv->message_q.lock);
 822                 }
 823
 824         } else
 825                 skb_queue_head(&sk->sk_receive_queue, skb);
 826
 827 done:
 828         return err ? : copied;
 829 }
 830
 831 static inline unsigned int iucv_accept_poll(struct sock *parent)
 832 {
 833         struct iucv_sock *isk, *n;
 834         struct sock *sk;
 835
 836         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 837                 sk = (struct sock *) isk;
 838
 839                 if (sk->sk_state == IUCV_CONNECTED)
 840                         return POLLIN | POLLRDNORM;
 841         }
 842
 843         return 0;
 844 }
 845
 846 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
 847                             poll_table *wait)
 848 {
 849         struct sock *sk = sock->sk;
 850         unsigned int mask = 0;
 851
 852         poll_wait(file, sk->sk_sleep, wait);
 853
 854         if (sk->sk_state == IUCV_LISTEN)
 855                 return iucv_accept_poll(sk);
 856
 857         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
 858                 mask |= POLLERR;
 859
 860         if (sk->sk_shutdown & RCV_SHUTDOWN)
 861                 mask |= POLLRDHUP;
 862
 863         if (sk->sk_shutdown == SHUTDOWN_MASK)
 864                 mask |= POLLHUP;
 865
 866         if (!skb_queue_empty(&sk->sk_receive_queue) ||
 867             (sk->sk_shutdown & RCV_SHUTDOWN))
 868                 mask |= POLLIN | POLLRDNORM;
 869
 870         if (sk->sk_state == IUCV_CLOSED)
 871                 mask |= POLLHUP;
 872
 873         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
 874                 mask |= POLLIN;
 875
 876         if (sock_writeable(sk))
 877                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
 878         else
 879                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 880
 881         return mask;
 882 }
 883
 884 static int iucv_sock_shutdown(struct socket *sock, int how)
 885 {
 886         struct sock *sk = sock->sk;
 887         struct iucv_sock *iucv = iucv_sk(sk);
 888         struct iucv_message txmsg;
 889         int err = 0;
 890         u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
 891
 892         how++;
 893
 894         if ((how & ~SHUTDOWN_MASK) || !how)
 895                 return -EINVAL;
 896
 897         lock_sock(sk);
 898         switch (sk->sk_state) {
 899         case IUCV_CLOSED:
 900                 err = -ENOTCONN;
 901                 goto fail;
 902
 903         default:
 904                 sk->sk_shutdown |= how;
 905                 break;
 906         }
 907
 908         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
 909                 txmsg.class = 0;
 910                 txmsg.tag = 0;
 911                 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
 912                                         (void *) prmmsg, 8);
 913                 if (err) {
 914                         switch (err) {
 915                         case 1:
 916                                 err = -ENOTCONN;
 917                                 break;
 918                         case 2:
 919                                 err = -ECONNRESET;
 920                                 break;
 921                         default:
 922                                 err = -ENOTCONN;
 923                                 break;
 924                         }
 925                 }
 926         }
 927
 928         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
 929                 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
 930                 if (err)
 931                         err = -ENOTCONN;
 932
 933                 skb_queue_purge(&sk->sk_receive_queue);
 934         }
 935
 936         /* Wake up anyone sleeping in poll */
 937         sk->sk_state_change(sk);
 938
 939 fail:
 940         release_sock(sk);
 941         return err;
 942 }
 943
 944 static int iucv_sock_release(struct socket *sock)
 945 {
 946         struct sock *sk = sock->sk;
 947         int err = 0;
 948
 949         if (!sk)
 950                 return 0;
 951
 952         iucv_sock_close(sk);
 953
 954         /* Unregister with IUCV base support */
 955         if (iucv_sk(sk)->path) {
 956                 iucv_path_sever(iucv_sk(sk)->path, NULL);
 957                 iucv_path_free(iucv_sk(sk)->path);
 958                 iucv_sk(sk)->path = NULL;
 959         }
 960
 961         sock_orphan(sk);
 962         iucv_sock_kill(sk);
 963         return err;
 964 }
 965
 966 /* Callback wrappers - called from iucv base support */
 967 static int iucv_callback_connreq(struct iucv_path *path,
 968                                  u8 ipvmid[8], u8 ipuser[16])
 969 {
 970         unsigned char user_data[16];
 971         unsigned char nuser_data[16];
 972         unsigned char src_name[8];
 973         struct hlist_node *node;
 974         struct sock *sk, *nsk;
 975         struct iucv_sock *iucv, *niucv;
 976         int err;
 977
 978         memcpy(src_name, ipuser, 8);
 979         EBCASC(src_name, 8);
 980         /* Find out if this path belongs to af_iucv. */
 981         read_lock(&iucv_sk_list.lock);
 982         iucv = NULL;
 983         sk = NULL;
 984         sk_for_each(sk, node, &iucv_sk_list.head)
 985                 if (sk->sk_state == IUCV_LISTEN &&
 986                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
 987                         /*
 988                          * Found a listening socket with
 989                          * src_name == ipuser[0-7].
 990                          */
 991                         iucv = iucv_sk(sk);
 992                         break;
 993                 }
 994         read_unlock(&iucv_sk_list.lock);
 995         if (!iucv)
 996                 /* No socket found, not one of our paths. */
 997                 return -EINVAL;
 998
 999         bh_lock_sock(sk);
1000
1001         /* Check if parent socket is listening */
1002         low_nmcpy(user_data, iucv->src_name);
1003         high_nmcpy(user_data, iucv->dst_name);
1004         ASCEBC(user_data, sizeof(user_data));
1005         if (sk->sk_state != IUCV_LISTEN) {
1006                 err = iucv_path_sever(path, user_data);
1007                 goto fail;
1008         }
1009
1010         /* Check for backlog size */
1011         if (sk_acceptq_is_full(sk)) {
1012                 err = iucv_path_sever(path, user_data);
1013                 goto fail;
1014         }
1015
1016         /* Create the new socket */
1017         nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
1018         if (!nsk) {
1019                 err = iucv_path_sever(path, user_data);
1020                 goto fail;
1021         }
1022
1023         niucv = iucv_sk(nsk);
1024         iucv_sock_init(nsk, sk);
1025
1026         /* Set the new iucv_sock */
1027         memcpy(niucv->dst_name, ipuser + 8, 8);
1028         EBCASC(niucv->dst_name, 8);
1029         memcpy(niucv->dst_user_id, ipvmid, 8);
1030         memcpy(niucv->src_name, iucv->src_name, 8);
1031         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1032         niucv->path = path;
1033
1034         /* Call iucv_accept */
1035         high_nmcpy(nuser_data, ipuser + 8);
1036         memcpy(nuser_data + 8, niucv->src_name, 8);
1037         ASCEBC(nuser_data + 8, 8);
1038
1039         path->msglim = IUCV_QUEUELEN_DEFAULT;
1040         err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1041         if (err) {
1042                 err = iucv_path_sever(path, user_data);
1043                 goto fail;
1044         }
1045
1046         iucv_accept_enqueue(sk, nsk);
1047
1048         /* Wake up accept */
1049         nsk->sk_state = IUCV_CONNECTED;
1050         sk->sk_data_ready(sk, 1);
1051         err = 0;
1052 fail:
1053         bh_unlock_sock(sk);
1054         return 0;
1055 }
1056
1057 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1058 {
1059         struct sock *sk = path->private;
1060
1061         sk->sk_state = IUCV_CONNECTED;
1062         sk->sk_state_change(sk);
1063 }
1064
1065 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1066 {
1067         struct sock *sk = path->private;
1068         struct iucv_sock *iucv = iucv_sk(sk);
1069         struct sk_buff *skb;
1070         struct sock_msg_q *save_msg;
1071         int len;
1072
1073         if (sk->sk_shutdown & RCV_SHUTDOWN)
1074                 return;
1075
1076         if (!list_empty(&iucv->message_q.list) ||
1077             !skb_queue_empty(&iucv->backlog_skb_q))
1078                 goto save_message;
1079
1080         len = atomic_read(&sk->sk_rmem_alloc);
1081         len += msg->length + sizeof(struct sk_buff);
1082         if (len > sk->sk_rcvbuf)
1083                 goto save_message;
1084
1085         skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
1086         if (!skb)
1087                 goto save_message;
1088
1089         spin_lock(&iucv->message_q.lock);
1090         iucv_process_message(sk, skb, path, msg);
1091         spin_unlock(&iucv->message_q.lock);
1092
1093         return;
1094
1095 save_message:
1096         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1097         save_msg->path = path;
1098         save_msg->msg = *msg;
1099
1100         spin_lock(&iucv->message_q.lock);
1101         list_add_tail(&save_msg->list, &iucv->message_q.list);
1102         spin_unlock(&iucv->message_q.lock);
1103 }
1104
1105 static void iucv_callback_txdone(struct iucv_path *path,
1106                                  struct iucv_message *msg)
1107 {
1108         struct sock *sk = path->private;
1109         struct sk_buff *this;
1110         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1111         struct sk_buff *list_skb = list->next;
1112         unsigned long flags;
1113
1114         if (list_skb) {
1115                 spin_lock_irqsave(&list->lock, flags);
1116
1117                 do {
1118                         this = list_skb;
1119                         list_skb = list_skb->next;
1120                 } while (memcmp(&msg->tag, this->cb, 4) && list_skb);
1121
1122                 spin_unlock_irqrestore(&list->lock, flags);
1123
1124                 skb_unlink(this, &iucv_sk(sk)->send_skb_q);
1125                 kfree_skb(this);
1126         }
1127
1128         if (sk->sk_state == IUCV_CLOSING) {
1129                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1130                         sk->sk_state = IUCV_CLOSED;
1131                         sk->sk_state_change(sk);
1132                 }
1133         }
1134
1135 }
1136
1137 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1138 {
1139         struct sock *sk = path->private;
1140
1141         if (!list_empty(&iucv_sk(sk)->accept_q))
1142                 sk->sk_state = IUCV_SEVERED;
1143         else
1144                 sk->sk_state = IUCV_DISCONN;
1145
1146         sk->sk_state_change(sk);
1147 }
1148
1149 static struct proto_ops iucv_sock_ops = {
1150         .family         = PF_IUCV,
1151         .owner          = THIS_MODULE,
1152         .release        = iucv_sock_release,
1153         .bind           = iucv_sock_bind,
1154         .connect        = iucv_sock_connect,
1155         .listen         = iucv_sock_listen,
1156         .accept         = iucv_sock_accept,
1157         .getname        = iucv_sock_getname,
1158         .sendmsg        = iucv_sock_sendmsg,
1159         .recvmsg        = iucv_sock_recvmsg,
1160         .poll           = iucv_sock_poll,
1161         .ioctl          = sock_no_ioctl,
1162         .mmap           = sock_no_mmap,
1163         .socketpair     = sock_no_socketpair,
1164         .shutdown       = iucv_sock_shutdown,
1165         .setsockopt     = sock_no_setsockopt,
1166         .getsockopt     = sock_no_getsockopt
1167 };
1168
1169 static struct net_proto_family iucv_sock_family_ops = {
1170         .family = AF_IUCV,
1171         .owner  = THIS_MODULE,
1172         .create = iucv_sock_create,
1173 };
1174
1175 static int __init afiucv_init(void)
1176 {
1177         int err;
1178
1179         if (!MACHINE_IS_VM) {
1180                 printk(KERN_ERR "AF_IUCV connection needs VM as base\n");
1181                 err = -EPROTONOSUPPORT;
1182                 goto out;
1183         }
1184         cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1185         if (unlikely(err)) {
1186                 printk(KERN_ERR "AF_IUCV needs the VM userid\n");
1187                 err = -EPROTONOSUPPORT;
1188                 goto out;
1189         }
1190
1191         err = iucv_register(&af_iucv_handler, 0);
1192         if (err)
1193                 goto out;
1194         err = proto_register(&iucv_proto, 0);
1195         if (err)
1196                 goto out_iucv;
1197         err = sock_register(&iucv_sock_family_ops);
1198         if (err)
1199                 goto out_proto;
1200         printk(KERN_INFO "AF_IUCV lowlevel driver initialized\n");
1201         return 0;
1202
1203 out_proto:
1204         proto_unregister(&iucv_proto);
1205 out_iucv:
1206         iucv_unregister(&af_iucv_handler, 0);
1207 out:
1208         return err;
1209 }
1210
1211 static void __exit afiucv_exit(void)
1212 {
1213         sock_unregister(PF_IUCV);
1214         proto_unregister(&iucv_proto);
1215         iucv_unregister(&af_iucv_handler, 0);
1216
1217         printk(KERN_INFO "AF_IUCV lowlevel driver unloaded\n");
1218 }
1219
1220 module_init(afiucv_init);
1221 module_exit(afiucv_exit);
1222
1223 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1224 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1225 MODULE_VERSION(VERSION);
1226 MODULE_LICENSE("GPL");
1227 MODULE_ALIAS_NETPROTO(PF_IUCV);