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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(iucv_sk_list.lock),
  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         if (!iucv->path) {
 486                 err = -ENOMEM;
 487                 goto done;
 488         }
 489         err = iucv_path_connect(iucv->path, &af_iucv_handler,
 490                                 sa->siucv_user_id, NULL, user_data, sk);
 491         if (err) {
 492                 iucv_path_free(iucv->path);
 493                 iucv->path = NULL;
 494                 err = -ECONNREFUSED;
 495                 goto done;
 496         }
 497
 498         if (sk->sk_state != IUCV_CONNECTED) {
 499                 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
 500                                 sock_sndtimeo(sk, flags & O_NONBLOCK));
 501         }
 502
 503         if (sk->sk_state == IUCV_DISCONN) {
 504                 release_sock(sk);
 505                 return -ECONNREFUSED;
 506         }
 507 done:
 508         release_sock(sk);
 509         return err;
 510 }
 511
 512 /* Move a socket into listening state. */
 513 static int iucv_sock_listen(struct socket *sock, int backlog)
 514 {
 515         struct sock *sk = sock->sk;
 516         int err;
 517
 518         lock_sock(sk);
 519
 520         err = -EINVAL;
 521         if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM)
 522                 goto done;
 523
 524         sk->sk_max_ack_backlog = backlog;
 525         sk->sk_ack_backlog = 0;
 526         sk->sk_state = IUCV_LISTEN;
 527         err = 0;
 528
 529 done:
 530         release_sock(sk);
 531         return err;
 532 }
 533
 534 /* Accept a pending connection */
 535 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 536                             int flags)
 537 {
 538         DECLARE_WAITQUEUE(wait, current);
 539         struct sock *sk = sock->sk, *nsk;
 540         long timeo;
 541         int err = 0;
 542
 543         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 544
 545         if (sk->sk_state != IUCV_LISTEN) {
 546                 err = -EBADFD;
 547                 goto done;
 548         }
 549
 550         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 551
 552         /* Wait for an incoming connection */
 553         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 554         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 555                 set_current_state(TASK_INTERRUPTIBLE);
 556                 if (!timeo) {
 557                         err = -EAGAIN;
 558                         break;
 559                 }
 560
 561                 release_sock(sk);
 562                 timeo = schedule_timeout(timeo);
 563                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 564
 565                 if (sk->sk_state != IUCV_LISTEN) {
 566                         err = -EBADFD;
 567                         break;
 568                 }
 569
 570                 if (signal_pending(current)) {
 571                         err = sock_intr_errno(timeo);
 572                         break;
 573                 }
 574         }
 575
 576         set_current_state(TASK_RUNNING);
 577         remove_wait_queue(sk->sk_sleep, &wait);
 578
 579         if (err)
 580                 goto done;
 581
 582         newsock->state = SS_CONNECTED;
 583
 584 done:
 585         release_sock(sk);
 586         return err;
 587 }
 588
 589 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 590                              int *len, int peer)
 591 {
 592         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 593         struct sock *sk = sock->sk;
 594
 595         addr->sa_family = AF_IUCV;
 596         *len = sizeof(struct sockaddr_iucv);
 597
 598         if (peer) {
 599                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
 600                 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
 601         } else {
 602                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
 603                 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
 604         }
 605         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
 606         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
 607         memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
 608
 609         return 0;
 610 }
 611
 612 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 613                              struct msghdr *msg, size_t len)
 614 {
 615         struct sock *sk = sock->sk;
 616         struct iucv_sock *iucv = iucv_sk(sk);
 617         struct sk_buff *skb;
 618         struct iucv_message txmsg;
 619         int err;
 620
 621         err = sock_error(sk);
 622         if (err)
 623                 return err;
 624
 625         if (msg->msg_flags & MSG_OOB)
 626                 return -EOPNOTSUPP;
 627
 628         lock_sock(sk);
 629
 630         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 631                 err = -EPIPE;
 632                 goto out;
 633         }
 634
 635         if (sk->sk_state == IUCV_CONNECTED) {
 636                 if (!(skb = sock_alloc_send_skb(sk, len,
 637                                                 msg->msg_flags & MSG_DONTWAIT,
 638                                                 &err)))
 639                         goto out;
 640
 641                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 642                         err = -EFAULT;
 643                         goto fail;
 644                 }
 645
 646                 txmsg.class = 0;
 647                 memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len);
 648                 txmsg.tag = iucv->send_tag++;
 649                 memcpy(skb->cb, &txmsg.tag, 4);
 650                 skb_queue_tail(&iucv->send_skb_q, skb);
 651                 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
 652                                         (void *) skb->data, skb->len);
 653                 if (err) {
 654                         if (err == 3)
 655                                 printk(KERN_ERR "AF_IUCV msg limit exceeded\n");
 656                         skb_unlink(skb, &iucv->send_skb_q);
 657                         err = -EPIPE;
 658                         goto fail;
 659                 }
 660
 661         } else {
 662                 err = -ENOTCONN;
 663                 goto out;
 664         }
 665
 666         release_sock(sk);
 667         return len;
 668
 669 fail:
 670         kfree_skb(skb);
 671 out:
 672         release_sock(sk);
 673         return err;
 674 }
 675
 676 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
 677 {
 678         int dataleft, size, copied = 0;
 679         struct sk_buff *nskb;
 680
 681         dataleft = len;
 682         while (dataleft) {
 683                 if (dataleft >= sk->sk_rcvbuf / 4)
 684                         size = sk->sk_rcvbuf / 4;
 685                 else
 686                         size = dataleft;
 687
 688                 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
 689                 if (!nskb)
 690                         return -ENOMEM;
 691
 692                 memcpy(nskb->data, skb->data + copied, size);
 693                 copied += size;
 694                 dataleft -= size;
 695
 696                 skb_reset_transport_header(nskb);
 697                 skb_reset_network_header(nskb);
 698                 nskb->len = size;
 699
 700                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
 701         }
 702
 703         return 0;
 704 }
 705
 706 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
 707                                  struct iucv_path *path,
 708                                  struct iucv_message *msg)
 709 {
 710         int rc;
 711
 712         if (msg->flags & IPRMDATA) {
 713                 skb->data = NULL;
 714                 skb->len = 0;
 715         } else {
 716                 rc = iucv_message_receive(path, msg, 0, skb->data,
 717                                           msg->length, NULL);
 718                 if (rc) {
 719                         kfree_skb(skb);
 720                         return;
 721                 }
 722                 if (skb->truesize >= sk->sk_rcvbuf / 4) {
 723                         rc = iucv_fragment_skb(sk, skb, msg->length);
 724                         kfree_skb(skb);
 725                         skb = NULL;
 726                         if (rc) {
 727                                 iucv_path_sever(path, NULL);
 728                                 return;
 729                         }
 730                         skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
 731                 } else {
 732                         skb_reset_transport_header(skb);
 733                         skb_reset_network_header(skb);
 734                         skb->len = msg->length;
 735                 }
 736         }
 737
 738         if (sock_queue_rcv_skb(sk, skb))
 739                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
 740 }
 741
 742 static void iucv_process_message_q(struct sock *sk)
 743 {
 744         struct iucv_sock *iucv = iucv_sk(sk);
 745         struct sk_buff *skb;
 746         struct sock_msg_q *p, *n;
 747
 748         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
 749                 skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA);
 750                 if (!skb)
 751                         break;
 752                 iucv_process_message(sk, skb, p->path, &p->msg);
 753                 list_del(&p->list);
 754                 kfree(p);
 755                 if (!skb_queue_empty(&iucv->backlog_skb_q))
 756                         break;
 757         }
 758 }
 759
 760 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 761                              struct msghdr *msg, size_t len, int flags)
 762 {
 763         int noblock = flags & MSG_DONTWAIT;
 764         struct sock *sk = sock->sk;
 765         struct iucv_sock *iucv = iucv_sk(sk);
 766         int target, copied = 0;
 767         struct sk_buff *skb, *rskb, *cskb;
 768         int err = 0;
 769
 770         if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
 771             skb_queue_empty(&iucv->backlog_skb_q) &&
 772             skb_queue_empty(&sk->sk_receive_queue) &&
 773             list_empty(&iucv->message_q.list))
 774                 return 0;
 775
 776         if (flags & (MSG_OOB))
 777                 return -EOPNOTSUPP;
 778
 779         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
 780
 781         skb = skb_recv_datagram(sk, flags, noblock, &err);
 782         if (!skb) {
 783                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 784                         return 0;
 785                 return err;
 786         }
 787
 788         copied = min_t(unsigned int, skb->len, len);
 789
 790         cskb = skb;
 791         if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
 792                 skb_queue_head(&sk->sk_receive_queue, skb);
 793                 if (copied == 0)
 794                         return -EFAULT;
 795                 goto done;
 796         }
 797
 798         len -= copied;
 799
 800         /* Mark read part of skb as used */
 801         if (!(flags & MSG_PEEK)) {
 802                 skb_pull(skb, copied);
 803
 804                 if (skb->len) {
 805                         skb_queue_head(&sk->sk_receive_queue, skb);
 806                         goto done;
 807                 }
 808
 809                 kfree_skb(skb);
 810
 811                 /* Queue backlog skbs */
 812                 rskb = skb_dequeue(&iucv->backlog_skb_q);
 813                 while (rskb) {
 814                         if (sock_queue_rcv_skb(sk, rskb)) {
 815                                 skb_queue_head(&iucv->backlog_skb_q,
 816                                                 rskb);
 817                                 break;
 818                         } else {
 819                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
 820                         }
 821                 }
 822                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
 823                         spin_lock_bh(&iucv->message_q.lock);
 824                         if (!list_empty(&iucv->message_q.list))
 825                                 iucv_process_message_q(sk);
 826                         spin_unlock_bh(&iucv->message_q.lock);
 827                 }
 828
 829         } else
 830                 skb_queue_head(&sk->sk_receive_queue, skb);
 831
 832 done:
 833         return err ? : copied;
 834 }
 835
 836 static inline unsigned int iucv_accept_poll(struct sock *parent)
 837 {
 838         struct iucv_sock *isk, *n;
 839         struct sock *sk;
 840
 841         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 842                 sk = (struct sock *) isk;
 843
 844                 if (sk->sk_state == IUCV_CONNECTED)
 845                         return POLLIN | POLLRDNORM;
 846         }
 847
 848         return 0;
 849 }
 850
 851 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
 852                             poll_table *wait)
 853 {
 854         struct sock *sk = sock->sk;
 855         unsigned int mask = 0;
 856
 857         poll_wait(file, sk->sk_sleep, wait);
 858
 859         if (sk->sk_state == IUCV_LISTEN)
 860                 return iucv_accept_poll(sk);
 861
 862         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
 863                 mask |= POLLERR;
 864
 865         if (sk->sk_shutdown & RCV_SHUTDOWN)
 866                 mask |= POLLRDHUP;
 867
 868         if (sk->sk_shutdown == SHUTDOWN_MASK)
 869                 mask |= POLLHUP;
 870
 871         if (!skb_queue_empty(&sk->sk_receive_queue) ||
 872             (sk->sk_shutdown & RCV_SHUTDOWN))
 873                 mask |= POLLIN | POLLRDNORM;
 874
 875         if (sk->sk_state == IUCV_CLOSED)
 876                 mask |= POLLHUP;
 877
 878         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
 879                 mask |= POLLIN;
 880
 881         if (sock_writeable(sk))
 882                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
 883         else
 884                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 885
 886         return mask;
 887 }
 888
 889 static int iucv_sock_shutdown(struct socket *sock, int how)
 890 {
 891         struct sock *sk = sock->sk;
 892         struct iucv_sock *iucv = iucv_sk(sk);
 893         struct iucv_message txmsg;
 894         int err = 0;
 895         u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
 896
 897         how++;
 898
 899         if ((how & ~SHUTDOWN_MASK) || !how)
 900                 return -EINVAL;
 901
 902         lock_sock(sk);
 903         switch (sk->sk_state) {
 904         case IUCV_CLOSED:
 905                 err = -ENOTCONN;
 906                 goto fail;
 907
 908         default:
 909                 sk->sk_shutdown |= how;
 910                 break;
 911         }
 912
 913         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
 914                 txmsg.class = 0;
 915                 txmsg.tag = 0;
 916                 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
 917                                         (void *) prmmsg, 8);
 918                 if (err) {
 919                         switch (err) {
 920                         case 1:
 921                                 err = -ENOTCONN;
 922                                 break;
 923                         case 2:
 924                                 err = -ECONNRESET;
 925                                 break;
 926                         default:
 927                                 err = -ENOTCONN;
 928                                 break;
 929                         }
 930                 }
 931         }
 932
 933         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
 934                 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
 935                 if (err)
 936                         err = -ENOTCONN;
 937
 938                 skb_queue_purge(&sk->sk_receive_queue);
 939         }
 940
 941         /* Wake up anyone sleeping in poll */
 942         sk->sk_state_change(sk);
 943
 944 fail:
 945         release_sock(sk);
 946         return err;
 947 }
 948
 949 static int iucv_sock_release(struct socket *sock)
 950 {
 951         struct sock *sk = sock->sk;
 952         int err = 0;
 953
 954         if (!sk)
 955                 return 0;
 956
 957         iucv_sock_close(sk);
 958
 959         /* Unregister with IUCV base support */
 960         if (iucv_sk(sk)->path) {
 961                 iucv_path_sever(iucv_sk(sk)->path, NULL);
 962                 iucv_path_free(iucv_sk(sk)->path);
 963                 iucv_sk(sk)->path = NULL;
 964         }
 965
 966         sock_orphan(sk);
 967         iucv_sock_kill(sk);
 968         return err;
 969 }
 970
 971 /* Callback wrappers - called from iucv base support */
 972 static int iucv_callback_connreq(struct iucv_path *path,
 973                                  u8 ipvmid[8], u8 ipuser[16])
 974 {
 975         unsigned char user_data[16];
 976         unsigned char nuser_data[16];
 977         unsigned char src_name[8];
 978         struct hlist_node *node;
 979         struct sock *sk, *nsk;
 980         struct iucv_sock *iucv, *niucv;
 981         int err;
 982
 983         memcpy(src_name, ipuser, 8);
 984         EBCASC(src_name, 8);
 985         /* Find out if this path belongs to af_iucv. */
 986         read_lock(&iucv_sk_list.lock);
 987         iucv = NULL;
 988         sk = NULL;
 989         sk_for_each(sk, node, &iucv_sk_list.head)
 990                 if (sk->sk_state == IUCV_LISTEN &&
 991                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
 992                         /*
 993                          * Found a listening socket with
 994                          * src_name == ipuser[0-7].
 995                          */
 996                         iucv = iucv_sk(sk);
 997                         break;
 998                 }
 999         read_unlock(&iucv_sk_list.lock);
1000         if (!iucv)
1001                 /* No socket found, not one of our paths. */
1002                 return -EINVAL;
1003
1004         bh_lock_sock(sk);
1005
1006         /* Check if parent socket is listening */
1007         low_nmcpy(user_data, iucv->src_name);
1008         high_nmcpy(user_data, iucv->dst_name);
1009         ASCEBC(user_data, sizeof(user_data));
1010         if (sk->sk_state != IUCV_LISTEN) {
1011                 err = iucv_path_sever(path, user_data);
1012                 goto fail;
1013         }
1014
1015         /* Check for backlog size */
1016         if (sk_acceptq_is_full(sk)) {
1017                 err = iucv_path_sever(path, user_data);
1018                 goto fail;
1019         }
1020
1021         /* Create the new socket */
1022         nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
1023         if (!nsk) {
1024                 err = iucv_path_sever(path, user_data);
1025                 goto fail;
1026         }
1027
1028         niucv = iucv_sk(nsk);
1029         iucv_sock_init(nsk, sk);
1030
1031         /* Set the new iucv_sock */
1032         memcpy(niucv->dst_name, ipuser + 8, 8);
1033         EBCASC(niucv->dst_name, 8);
1034         memcpy(niucv->dst_user_id, ipvmid, 8);
1035         memcpy(niucv->src_name, iucv->src_name, 8);
1036         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1037         niucv->path = path;
1038
1039         /* Call iucv_accept */
1040         high_nmcpy(nuser_data, ipuser + 8);
1041         memcpy(nuser_data + 8, niucv->src_name, 8);
1042         ASCEBC(nuser_data + 8, 8);
1043
1044         path->msglim = IUCV_QUEUELEN_DEFAULT;
1045         err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1046         if (err) {
1047                 err = iucv_path_sever(path, user_data);
1048                 goto fail;
1049         }
1050
1051         iucv_accept_enqueue(sk, nsk);
1052
1053         /* Wake up accept */
1054         nsk->sk_state = IUCV_CONNECTED;
1055         sk->sk_data_ready(sk, 1);
1056         err = 0;
1057 fail:
1058         bh_unlock_sock(sk);
1059         return 0;
1060 }
1061
1062 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1063 {
1064         struct sock *sk = path->private;
1065
1066         sk->sk_state = IUCV_CONNECTED;
1067         sk->sk_state_change(sk);
1068 }
1069
1070 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1071 {
1072         struct sock *sk = path->private;
1073         struct iucv_sock *iucv = iucv_sk(sk);
1074         struct sk_buff *skb;
1075         struct sock_msg_q *save_msg;
1076         int len;
1077
1078         if (sk->sk_shutdown & RCV_SHUTDOWN)
1079                 return;
1080
1081         if (!list_empty(&iucv->message_q.list) ||
1082             !skb_queue_empty(&iucv->backlog_skb_q))
1083                 goto save_message;
1084
1085         len = atomic_read(&sk->sk_rmem_alloc);
1086         len += msg->length + sizeof(struct sk_buff);
1087         if (len > sk->sk_rcvbuf)
1088                 goto save_message;
1089
1090         skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
1091         if (!skb)
1092                 goto save_message;
1093
1094         spin_lock(&iucv->message_q.lock);
1095         iucv_process_message(sk, skb, path, msg);
1096         spin_unlock(&iucv->message_q.lock);
1097
1098         return;
1099
1100 save_message:
1101         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1102         if (!save_msg)
1103                 return;
1104         save_msg->path = path;
1105         save_msg->msg = *msg;
1106
1107         spin_lock(&iucv->message_q.lock);
1108         list_add_tail(&save_msg->list, &iucv->message_q.list);
1109         spin_unlock(&iucv->message_q.lock);
1110 }
1111
1112 static void iucv_callback_txdone(struct iucv_path *path,
1113                                  struct iucv_message *msg)
1114 {
1115         struct sock *sk = path->private;
1116         struct sk_buff *this = NULL;
1117         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1118         struct sk_buff *list_skb = list->next;
1119         unsigned long flags;
1120
1121         if (!skb_queue_empty(list)) {
1122                 spin_lock_irqsave(&list->lock, flags);
1123
1124                 while (list_skb != (struct sk_buff *)list) {
1125                         if (!memcmp(&msg->tag, list_skb->cb, 4)) {
1126                                 this = list_skb;
1127                                 break;
1128                         }
1129                         list_skb = list_skb->next;
1130                 }
1131                 if (this)
1132                         __skb_unlink(this, list);
1133
1134                 spin_unlock_irqrestore(&list->lock, flags);
1135
1136                 if (this)
1137                         kfree_skb(this);
1138         }
1139         if (!this)
1140                 printk(KERN_ERR "AF_IUCV msg tag %u not found\n", msg->tag);
1141
1142         if (sk->sk_state == IUCV_CLOSING) {
1143                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1144                         sk->sk_state = IUCV_CLOSED;
1145                         sk->sk_state_change(sk);
1146                 }
1147         }
1148
1149 }
1150
1151 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1152 {
1153         struct sock *sk = path->private;
1154
1155         if (!list_empty(&iucv_sk(sk)->accept_q))
1156                 sk->sk_state = IUCV_SEVERED;
1157         else
1158                 sk->sk_state = IUCV_DISCONN;
1159
1160         sk->sk_state_change(sk);
1161 }
1162
1163 static struct proto_ops iucv_sock_ops = {
1164         .family         = PF_IUCV,
1165         .owner          = THIS_MODULE,
1166         .release        = iucv_sock_release,
1167         .bind           = iucv_sock_bind,
1168         .connect        = iucv_sock_connect,
1169         .listen         = iucv_sock_listen,
1170         .accept         = iucv_sock_accept,
1171         .getname        = iucv_sock_getname,
1172         .sendmsg        = iucv_sock_sendmsg,
1173         .recvmsg        = iucv_sock_recvmsg,
1174         .poll           = iucv_sock_poll,
1175         .ioctl          = sock_no_ioctl,
1176         .mmap           = sock_no_mmap,
1177         .socketpair     = sock_no_socketpair,
1178         .shutdown       = iucv_sock_shutdown,
1179         .setsockopt     = sock_no_setsockopt,
1180         .getsockopt     = sock_no_getsockopt
1181 };
1182
1183 static struct net_proto_family iucv_sock_family_ops = {
1184         .family = AF_IUCV,
1185         .owner  = THIS_MODULE,
1186         .create = iucv_sock_create,
1187 };
1188
1189 static int __init afiucv_init(void)
1190 {
1191         int err;
1192
1193         if (!MACHINE_IS_VM) {
1194                 printk(KERN_ERR "AF_IUCV connection needs VM as base\n");
1195                 err = -EPROTONOSUPPORT;
1196                 goto out;
1197         }
1198         cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1199         if (unlikely(err)) {
1200                 printk(KERN_ERR "AF_IUCV needs the VM userid\n");
1201                 err = -EPROTONOSUPPORT;
1202                 goto out;
1203         }
1204
1205         err = iucv_register(&af_iucv_handler, 0);
1206         if (err)
1207                 goto out;
1208         err = proto_register(&iucv_proto, 0);
1209         if (err)
1210                 goto out_iucv;
1211         err = sock_register(&iucv_sock_family_ops);
1212         if (err)
1213                 goto out_proto;
1214         printk(KERN_INFO "AF_IUCV lowlevel driver initialized\n");
1215         return 0;
1216
1217 out_proto:
1218         proto_unregister(&iucv_proto);
1219 out_iucv:
1220         iucv_unregister(&af_iucv_handler, 0);
1221 out:
1222         return err;
1223 }
1224
1225 static void __exit afiucv_exit(void)
1226 {
1227         sock_unregister(PF_IUCV);
1228         proto_unregister(&iucv_proto);
1229         iucv_unregister(&af_iucv_handler, 0);
1230
1231         printk(KERN_INFO "AF_IUCV lowlevel driver unloaded\n");
1232 }
1233
1234 module_init(afiucv_init);
1235 module_exit(afiucv_exit);
1236
1237 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1238 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1239 MODULE_VERSION(VERSION);
1240 MODULE_LICENSE("GPL");
1241 MODULE_ALIAS_NETPROTO(PF_IUCV);