af_iucv.c revision bf95d20fdbd602d72c28a009a55d90d5109b8a86
1/* 2 * IUCV protocol stack for Linux on zSeries 3 * 4 * Copyright IBM Corp. 2006, 2009 5 * 6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> 7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> 8 * PM functions: 9 * Ursula Braun <ursula.braun@de.ibm.com> 10 */ 11 12#define KMSG_COMPONENT "af_iucv" 13#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 14 15#include <linux/module.h> 16#include <linux/types.h> 17#include <linux/list.h> 18#include <linux/errno.h> 19#include <linux/kernel.h> 20#include <linux/sched.h> 21#include <linux/slab.h> 22#include <linux/skbuff.h> 23#include <linux/init.h> 24#include <linux/poll.h> 25#include <net/sock.h> 26#include <asm/ebcdic.h> 27#include <asm/cpcmd.h> 28#include <linux/kmod.h> 29 30#include <net/iucv/iucv.h> 31#include <net/iucv/af_iucv.h> 32 33#define VERSION "1.1" 34 35static char iucv_userid[80]; 36 37static const struct proto_ops iucv_sock_ops; 38 39static struct proto iucv_proto = { 40 .name = "AF_IUCV", 41 .owner = THIS_MODULE, 42 .obj_size = sizeof(struct iucv_sock), 43}; 44 45/* special AF_IUCV IPRM messages */ 46static const u8 iprm_shutdown[8] = 47 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 48 49#define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) 50 51/* macros to set/get socket control buffer at correct offset */ 52#define CB_TAG(skb) ((skb)->cb) /* iucv message tag */ 53#define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag)) 54#define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */ 55#define CB_TRGCLS_LEN (TRGCLS_SIZE) 56 57#define __iucv_sock_wait(sk, condition, timeo, ret) \ 58do { \ 59 DEFINE_WAIT(__wait); \ 60 long __timeo = timeo; \ 61 ret = 0; \ 62 prepare_to_wait(sk->sk_sleep, &__wait, TASK_INTERRUPTIBLE); \ 63 while (!(condition)) { \ 64 if (!__timeo) { \ 65 ret = -EAGAIN; \ 66 break; \ 67 } \ 68 if (signal_pending(current)) { \ 69 ret = sock_intr_errno(__timeo); \ 70 break; \ 71 } \ 72 release_sock(sk); \ 73 __timeo = schedule_timeout(__timeo); \ 74 lock_sock(sk); \ 75 ret = sock_error(sk); \ 76 if (ret) \ 77 break; \ 78 } \ 79 finish_wait(sk->sk_sleep, &__wait); \ 80} while (0) 81 82#define iucv_sock_wait(sk, condition, timeo) \ 83({ \ 84 int __ret = 0; \ 85 if (!(condition)) \ 86 __iucv_sock_wait(sk, condition, timeo, __ret); \ 87 __ret; \ 88}) 89 90static void iucv_sock_kill(struct sock *sk); 91static void iucv_sock_close(struct sock *sk); 92 93/* Call Back functions */ 94static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 95static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 96static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); 97static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], 98 u8 ipuser[16]); 99static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); 100static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); 101 102static struct iucv_sock_list iucv_sk_list = { 103 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 104 .autobind_name = ATOMIC_INIT(0) 105}; 106 107static struct iucv_handler af_iucv_handler = { 108 .path_pending = iucv_callback_connreq, 109 .path_complete = iucv_callback_connack, 110 .path_severed = iucv_callback_connrej, 111 .message_pending = iucv_callback_rx, 112 .message_complete = iucv_callback_txdone, 113 .path_quiesced = iucv_callback_shutdown, 114}; 115 116static inline void high_nmcpy(unsigned char *dst, char *src) 117{ 118 memcpy(dst, src, 8); 119} 120 121static inline void low_nmcpy(unsigned char *dst, char *src) 122{ 123 memcpy(&dst[8], src, 8); 124} 125 126static int afiucv_pm_prepare(struct device *dev) 127{ 128#ifdef CONFIG_PM_DEBUG 129 printk(KERN_WARNING "afiucv_pm_prepare\n"); 130#endif 131 return 0; 132} 133 134static void afiucv_pm_complete(struct device *dev) 135{ 136#ifdef CONFIG_PM_DEBUG 137 printk(KERN_WARNING "afiucv_pm_complete\n"); 138#endif 139 return; 140} 141 142/** 143 * afiucv_pm_freeze() - Freeze PM callback 144 * @dev: AFIUCV dummy device 145 * 146 * Sever all established IUCV communication pathes 147 */ 148static int afiucv_pm_freeze(struct device *dev) 149{ 150 struct iucv_sock *iucv; 151 struct sock *sk; 152 struct hlist_node *node; 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, node, &iucv_sk_list.head) { 160 iucv = iucv_sk(sk); 161 skb_queue_purge(&iucv->send_skb_q); 162 skb_queue_purge(&iucv->backlog_skb_q); 163 switch (sk->sk_state) { 164 case IUCV_SEVERED: 165 case IUCV_DISCONN: 166 case IUCV_CLOSING: 167 case IUCV_CONNECTED: 168 if (iucv->path) { 169 err = iucv_path_sever(iucv->path, NULL); 170 iucv_path_free(iucv->path); 171 iucv->path = NULL; 172 } 173 break; 174 case IUCV_OPEN: 175 case IUCV_BOUND: 176 case IUCV_LISTEN: 177 case IUCV_CLOSED: 178 default: 179 break; 180 } 181 } 182 read_unlock(&iucv_sk_list.lock); 183 return err; 184} 185 186/** 187 * afiucv_pm_restore_thaw() - Thaw and restore PM callback 188 * @dev: AFIUCV dummy device 189 * 190 * socket clean up after freeze 191 */ 192static int afiucv_pm_restore_thaw(struct device *dev) 193{ 194 struct iucv_sock *iucv; 195 struct sock *sk; 196 struct hlist_node *node; 197 198#ifdef CONFIG_PM_DEBUG 199 printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); 200#endif 201 read_lock(&iucv_sk_list.lock); 202 sk_for_each(sk, node, &iucv_sk_list.head) { 203 iucv = iucv_sk(sk); 204 switch (sk->sk_state) { 205 case IUCV_CONNECTED: 206 sk->sk_err = EPIPE; 207 sk->sk_state = IUCV_DISCONN; 208 sk->sk_state_change(sk); 209 break; 210 case IUCV_DISCONN: 211 case IUCV_SEVERED: 212 case IUCV_CLOSING: 213 case IUCV_LISTEN: 214 case IUCV_BOUND: 215 case IUCV_OPEN: 216 default: 217 break; 218 } 219 } 220 read_unlock(&iucv_sk_list.lock); 221 return 0; 222} 223 224static struct dev_pm_ops afiucv_pm_ops = { 225 .prepare = afiucv_pm_prepare, 226 .complete = afiucv_pm_complete, 227 .freeze = afiucv_pm_freeze, 228 .thaw = afiucv_pm_restore_thaw, 229 .restore = afiucv_pm_restore_thaw, 230}; 231 232static struct device_driver af_iucv_driver = { 233 .owner = THIS_MODULE, 234 .name = "afiucv", 235 .bus = &iucv_bus, 236 .pm = &afiucv_pm_ops, 237}; 238 239/* dummy device used as trigger for PM functions */ 240static struct device *af_iucv_dev; 241 242/** 243 * iucv_msg_length() - Returns the length of an iucv message. 244 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 245 * 246 * The function returns the length of the specified iucv message @msg of data 247 * stored in a buffer and of data stored in the parameter list (PRMDATA). 248 * 249 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 250 * data: 251 * PRMDATA[0..6] socket data (max 7 bytes); 252 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 253 * 254 * The socket data length is computed by substracting the socket data length 255 * value from 0xFF. 256 * If the socket data len is greater 7, then PRMDATA can be used for special 257 * notifications (see iucv_sock_shutdown); and further, 258 * if the socket data len is > 7, the function returns 8. 259 * 260 * Use this function to allocate socket buffers to store iucv message data. 261 */ 262static inline size_t iucv_msg_length(struct iucv_message *msg) 263{ 264 size_t datalen; 265 266 if (msg->flags & IUCV_IPRMDATA) { 267 datalen = 0xff - msg->rmmsg[7]; 268 return (datalen < 8) ? datalen : 8; 269 } 270 return msg->length; 271} 272 273/** 274 * iucv_sock_in_state() - check for specific states 275 * @sk: sock structure 276 * @state: first iucv sk state 277 * @state: second iucv sk state 278 * 279 * Returns true if the socket in either in the first or second state. 280 */ 281static int iucv_sock_in_state(struct sock *sk, int state, int state2) 282{ 283 return (sk->sk_state == state || sk->sk_state == state2); 284} 285 286/** 287 * iucv_below_msglim() - function to check if messages can be sent 288 * @sk: sock structure 289 * 290 * Returns true if the send queue length is lower than the message limit. 291 * Always returns true if the socket is not connected (no iucv path for 292 * checking the message limit). 293 */ 294static inline int iucv_below_msglim(struct sock *sk) 295{ 296 struct iucv_sock *iucv = iucv_sk(sk); 297 298 if (sk->sk_state != IUCV_CONNECTED) 299 return 1; 300 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); 301} 302 303/** 304 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 305 */ 306static void iucv_sock_wake_msglim(struct sock *sk) 307{ 308 read_lock(&sk->sk_callback_lock); 309 if (sk_has_sleeper(sk)) 310 wake_up_interruptible_all(sk->sk_sleep); 311 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 312 read_unlock(&sk->sk_callback_lock); 313} 314 315/* Timers */ 316static void iucv_sock_timeout(unsigned long arg) 317{ 318 struct sock *sk = (struct sock *)arg; 319 320 bh_lock_sock(sk); 321 sk->sk_err = ETIMEDOUT; 322 sk->sk_state_change(sk); 323 bh_unlock_sock(sk); 324 325 iucv_sock_kill(sk); 326 sock_put(sk); 327} 328 329static void iucv_sock_clear_timer(struct sock *sk) 330{ 331 sk_stop_timer(sk, &sk->sk_timer); 332} 333 334static struct sock *__iucv_get_sock_by_name(char *nm) 335{ 336 struct sock *sk; 337 struct hlist_node *node; 338 339 sk_for_each(sk, node, &iucv_sk_list.head) 340 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 341 return sk; 342 343 return NULL; 344} 345 346static void iucv_sock_destruct(struct sock *sk) 347{ 348 skb_queue_purge(&sk->sk_receive_queue); 349 skb_queue_purge(&sk->sk_write_queue); 350} 351 352/* Cleanup Listen */ 353static void iucv_sock_cleanup_listen(struct sock *parent) 354{ 355 struct sock *sk; 356 357 /* Close non-accepted connections */ 358 while ((sk = iucv_accept_dequeue(parent, NULL))) { 359 iucv_sock_close(sk); 360 iucv_sock_kill(sk); 361 } 362 363 parent->sk_state = IUCV_CLOSED; 364} 365 366/* Kill socket (only if zapped and orphaned) */ 367static void iucv_sock_kill(struct sock *sk) 368{ 369 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 370 return; 371 372 iucv_sock_unlink(&iucv_sk_list, sk); 373 sock_set_flag(sk, SOCK_DEAD); 374 sock_put(sk); 375} 376 377/* Close an IUCV socket */ 378static void iucv_sock_close(struct sock *sk) 379{ 380 unsigned char user_data[16]; 381 struct iucv_sock *iucv = iucv_sk(sk); 382 int err; 383 unsigned long timeo; 384 385 iucv_sock_clear_timer(sk); 386 lock_sock(sk); 387 388 switch (sk->sk_state) { 389 case IUCV_LISTEN: 390 iucv_sock_cleanup_listen(sk); 391 break; 392 393 case IUCV_CONNECTED: 394 case IUCV_DISCONN: 395 err = 0; 396 397 sk->sk_state = IUCV_CLOSING; 398 sk->sk_state_change(sk); 399 400 if (!skb_queue_empty(&iucv->send_skb_q)) { 401 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 402 timeo = sk->sk_lingertime; 403 else 404 timeo = IUCV_DISCONN_TIMEOUT; 405 err = iucv_sock_wait(sk, 406 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 407 timeo); 408 } 409 410 case IUCV_CLOSING: /* fall through */ 411 sk->sk_state = IUCV_CLOSED; 412 sk->sk_state_change(sk); 413 414 if (iucv->path) { 415 low_nmcpy(user_data, iucv->src_name); 416 high_nmcpy(user_data, iucv->dst_name); 417 ASCEBC(user_data, sizeof(user_data)); 418 err = iucv_path_sever(iucv->path, user_data); 419 iucv_path_free(iucv->path); 420 iucv->path = NULL; 421 } 422 423 sk->sk_err = ECONNRESET; 424 sk->sk_state_change(sk); 425 426 skb_queue_purge(&iucv->send_skb_q); 427 skb_queue_purge(&iucv->backlog_skb_q); 428 break; 429 430 default: 431 sock_set_flag(sk, SOCK_ZAPPED); 432 /* nothing to do here */ 433 break; 434 } 435 436 /* mark socket for deletion by iucv_sock_kill() */ 437 sock_set_flag(sk, SOCK_ZAPPED); 438 439 release_sock(sk); 440} 441 442static void iucv_sock_init(struct sock *sk, struct sock *parent) 443{ 444 if (parent) 445 sk->sk_type = parent->sk_type; 446} 447 448static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) 449{ 450 struct sock *sk; 451 452 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); 453 if (!sk) 454 return NULL; 455 456 sock_init_data(sock, sk); 457 INIT_LIST_HEAD(&iucv_sk(sk)->accept_q); 458 spin_lock_init(&iucv_sk(sk)->accept_q_lock); 459 skb_queue_head_init(&iucv_sk(sk)->send_skb_q); 460 INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list); 461 spin_lock_init(&iucv_sk(sk)->message_q.lock); 462 skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q); 463 iucv_sk(sk)->send_tag = 0; 464 iucv_sk(sk)->flags = 0; 465 iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT; 466 iucv_sk(sk)->path = NULL; 467 memset(&iucv_sk(sk)->src_user_id , 0, 32); 468 469 sk->sk_destruct = iucv_sock_destruct; 470 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 471 sk->sk_allocation = GFP_DMA; 472 473 sock_reset_flag(sk, SOCK_ZAPPED); 474 475 sk->sk_protocol = proto; 476 sk->sk_state = IUCV_OPEN; 477 478 setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk); 479 480 iucv_sock_link(&iucv_sk_list, sk); 481 return sk; 482} 483 484/* Create an IUCV socket */ 485static int iucv_sock_create(struct net *net, struct socket *sock, int protocol) 486{ 487 struct sock *sk; 488 489 if (protocol && protocol != PF_IUCV) 490 return -EPROTONOSUPPORT; 491 492 sock->state = SS_UNCONNECTED; 493 494 switch (sock->type) { 495 case SOCK_STREAM: 496 sock->ops = &iucv_sock_ops; 497 break; 498 case SOCK_SEQPACKET: 499 /* currently, proto ops can handle both sk types */ 500 sock->ops = &iucv_sock_ops; 501 break; 502 default: 503 return -ESOCKTNOSUPPORT; 504 } 505 506 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); 507 if (!sk) 508 return -ENOMEM; 509 510 iucv_sock_init(sk, NULL); 511 512 return 0; 513} 514 515void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 516{ 517 write_lock_bh(&l->lock); 518 sk_add_node(sk, &l->head); 519 write_unlock_bh(&l->lock); 520} 521 522void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 523{ 524 write_lock_bh(&l->lock); 525 sk_del_node_init(sk); 526 write_unlock_bh(&l->lock); 527} 528 529void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 530{ 531 unsigned long flags; 532 struct iucv_sock *par = iucv_sk(parent); 533 534 sock_hold(sk); 535 spin_lock_irqsave(&par->accept_q_lock, flags); 536 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 537 spin_unlock_irqrestore(&par->accept_q_lock, flags); 538 iucv_sk(sk)->parent = parent; 539 parent->sk_ack_backlog++; 540} 541 542void iucv_accept_unlink(struct sock *sk) 543{ 544 unsigned long flags; 545 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 546 547 spin_lock_irqsave(&par->accept_q_lock, flags); 548 list_del_init(&iucv_sk(sk)->accept_q); 549 spin_unlock_irqrestore(&par->accept_q_lock, flags); 550 iucv_sk(sk)->parent->sk_ack_backlog--; 551 iucv_sk(sk)->parent = NULL; 552 sock_put(sk); 553} 554 555struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 556{ 557 struct iucv_sock *isk, *n; 558 struct sock *sk; 559 560 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 561 sk = (struct sock *) isk; 562 lock_sock(sk); 563 564 if (sk->sk_state == IUCV_CLOSED) { 565 iucv_accept_unlink(sk); 566 release_sock(sk); 567 continue; 568 } 569 570 if (sk->sk_state == IUCV_CONNECTED || 571 sk->sk_state == IUCV_SEVERED || 572 sk->sk_state == IUCV_DISCONN || /* due to PM restore */ 573 !newsock) { 574 iucv_accept_unlink(sk); 575 if (newsock) 576 sock_graft(sk, newsock); 577 578 if (sk->sk_state == IUCV_SEVERED) 579 sk->sk_state = IUCV_DISCONN; 580 581 release_sock(sk); 582 return sk; 583 } 584 585 release_sock(sk); 586 } 587 return NULL; 588} 589 590/* Bind an unbound socket */ 591static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 592 int addr_len) 593{ 594 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 595 struct sock *sk = sock->sk; 596 struct iucv_sock *iucv; 597 int err; 598 599 /* Verify the input sockaddr */ 600 if (!addr || addr->sa_family != AF_IUCV) 601 return -EINVAL; 602 603 lock_sock(sk); 604 if (sk->sk_state != IUCV_OPEN) { 605 err = -EBADFD; 606 goto done; 607 } 608 609 write_lock_bh(&iucv_sk_list.lock); 610 611 iucv = iucv_sk(sk); 612 if (__iucv_get_sock_by_name(sa->siucv_name)) { 613 err = -EADDRINUSE; 614 goto done_unlock; 615 } 616 if (iucv->path) { 617 err = 0; 618 goto done_unlock; 619 } 620 621 /* Bind the socket */ 622 memcpy(iucv->src_name, sa->siucv_name, 8); 623 624 /* Copy the user id */ 625 memcpy(iucv->src_user_id, iucv_userid, 8); 626 sk->sk_state = IUCV_BOUND; 627 err = 0; 628 629done_unlock: 630 /* Release the socket list lock */ 631 write_unlock_bh(&iucv_sk_list.lock); 632done: 633 release_sock(sk); 634 return err; 635} 636 637/* Automatically bind an unbound socket */ 638static int iucv_sock_autobind(struct sock *sk) 639{ 640 struct iucv_sock *iucv = iucv_sk(sk); 641 char query_buffer[80]; 642 char name[12]; 643 int err = 0; 644 645 /* Set the userid and name */ 646 cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err); 647 if (unlikely(err)) 648 return -EPROTO; 649 650 memcpy(iucv->src_user_id, query_buffer, 8); 651 652 write_lock_bh(&iucv_sk_list.lock); 653 654 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 655 while (__iucv_get_sock_by_name(name)) { 656 sprintf(name, "%08x", 657 atomic_inc_return(&iucv_sk_list.autobind_name)); 658 } 659 660 write_unlock_bh(&iucv_sk_list.lock); 661 662 memcpy(&iucv->src_name, name, 8); 663 664 return err; 665} 666 667/* Connect an unconnected socket */ 668static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 669 int alen, int flags) 670{ 671 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 672 struct sock *sk = sock->sk; 673 struct iucv_sock *iucv; 674 unsigned char user_data[16]; 675 int err; 676 677 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) 678 return -EINVAL; 679 680 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 681 return -EBADFD; 682 683 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 684 return -EINVAL; 685 686 if (sk->sk_state == IUCV_OPEN) { 687 err = iucv_sock_autobind(sk); 688 if (unlikely(err)) 689 return err; 690 } 691 692 lock_sock(sk); 693 694 /* Set the destination information */ 695 memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8); 696 memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8); 697 698 high_nmcpy(user_data, sa->siucv_name); 699 low_nmcpy(user_data, iucv_sk(sk)->src_name); 700 ASCEBC(user_data, sizeof(user_data)); 701 702 iucv = iucv_sk(sk); 703 /* Create path. */ 704 iucv->path = iucv_path_alloc(iucv->msglimit, 705 IUCV_IPRMDATA, GFP_KERNEL); 706 if (!iucv->path) { 707 err = -ENOMEM; 708 goto done; 709 } 710 err = iucv_path_connect(iucv->path, &af_iucv_handler, 711 sa->siucv_user_id, NULL, user_data, sk); 712 if (err) { 713 iucv_path_free(iucv->path); 714 iucv->path = NULL; 715 switch (err) { 716 case 0x0b: /* Target communicator is not logged on */ 717 err = -ENETUNREACH; 718 break; 719 case 0x0d: /* Max connections for this guest exceeded */ 720 case 0x0e: /* Max connections for target guest exceeded */ 721 err = -EAGAIN; 722 break; 723 case 0x0f: /* Missing IUCV authorization */ 724 err = -EACCES; 725 break; 726 default: 727 err = -ECONNREFUSED; 728 break; 729 } 730 goto done; 731 } 732 733 if (sk->sk_state != IUCV_CONNECTED) { 734 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 735 IUCV_DISCONN), 736 sock_sndtimeo(sk, flags & O_NONBLOCK)); 737 } 738 739 if (sk->sk_state == IUCV_DISCONN) { 740 err = -ECONNREFUSED; 741 } 742 743 if (err) { 744 iucv_path_sever(iucv->path, NULL); 745 iucv_path_free(iucv->path); 746 iucv->path = NULL; 747 } 748 749done: 750 release_sock(sk); 751 return err; 752} 753 754/* Move a socket into listening state. */ 755static int iucv_sock_listen(struct socket *sock, int backlog) 756{ 757 struct sock *sk = sock->sk; 758 int err; 759 760 lock_sock(sk); 761 762 err = -EINVAL; 763 if (sk->sk_state != IUCV_BOUND) 764 goto done; 765 766 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 767 goto done; 768 769 sk->sk_max_ack_backlog = backlog; 770 sk->sk_ack_backlog = 0; 771 sk->sk_state = IUCV_LISTEN; 772 err = 0; 773 774done: 775 release_sock(sk); 776 return err; 777} 778 779/* Accept a pending connection */ 780static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 781 int flags) 782{ 783 DECLARE_WAITQUEUE(wait, current); 784 struct sock *sk = sock->sk, *nsk; 785 long timeo; 786 int err = 0; 787 788 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 789 790 if (sk->sk_state != IUCV_LISTEN) { 791 err = -EBADFD; 792 goto done; 793 } 794 795 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 796 797 /* Wait for an incoming connection */ 798 add_wait_queue_exclusive(sk->sk_sleep, &wait); 799 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 800 set_current_state(TASK_INTERRUPTIBLE); 801 if (!timeo) { 802 err = -EAGAIN; 803 break; 804 } 805 806 release_sock(sk); 807 timeo = schedule_timeout(timeo); 808 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 809 810 if (sk->sk_state != IUCV_LISTEN) { 811 err = -EBADFD; 812 break; 813 } 814 815 if (signal_pending(current)) { 816 err = sock_intr_errno(timeo); 817 break; 818 } 819 } 820 821 set_current_state(TASK_RUNNING); 822 remove_wait_queue(sk->sk_sleep, &wait); 823 824 if (err) 825 goto done; 826 827 newsock->state = SS_CONNECTED; 828 829done: 830 release_sock(sk); 831 return err; 832} 833 834static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 835 int *len, int peer) 836{ 837 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 838 struct sock *sk = sock->sk; 839 840 addr->sa_family = AF_IUCV; 841 *len = sizeof(struct sockaddr_iucv); 842 843 if (peer) { 844 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8); 845 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8); 846 } else { 847 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8); 848 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8); 849 } 850 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 851 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 852 memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 853 854 return 0; 855} 856 857/** 858 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 859 * @path: IUCV path 860 * @msg: Pointer to a struct iucv_message 861 * @skb: The socket data to send, skb->len MUST BE <= 7 862 * 863 * Send the socket data in the parameter list in the iucv message 864 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 865 * list and the socket data len at index 7 (last byte). 866 * See also iucv_msg_length(). 867 * 868 * Returns the error code from the iucv_message_send() call. 869 */ 870static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 871 struct sk_buff *skb) 872{ 873 u8 prmdata[8]; 874 875 memcpy(prmdata, (void *) skb->data, skb->len); 876 prmdata[7] = 0xff - (u8) skb->len; 877 return iucv_message_send(path, msg, IUCV_IPRMDATA, 0, 878 (void *) prmdata, 8); 879} 880 881static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, 882 struct msghdr *msg, size_t len) 883{ 884 struct sock *sk = sock->sk; 885 struct iucv_sock *iucv = iucv_sk(sk); 886 struct sk_buff *skb; 887 struct iucv_message txmsg; 888 struct cmsghdr *cmsg; 889 int cmsg_done; 890 long timeo; 891 char user_id[9]; 892 char appl_id[9]; 893 int err; 894 int noblock = msg->msg_flags & MSG_DONTWAIT; 895 896 err = sock_error(sk); 897 if (err) 898 return err; 899 900 if (msg->msg_flags & MSG_OOB) 901 return -EOPNOTSUPP; 902 903 /* SOCK_SEQPACKET: we do not support segmented records */ 904 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 905 return -EOPNOTSUPP; 906 907 lock_sock(sk); 908 909 if (sk->sk_shutdown & SEND_SHUTDOWN) { 910 err = -EPIPE; 911 goto out; 912 } 913 914 /* Return if the socket is not in connected state */ 915 if (sk->sk_state != IUCV_CONNECTED) { 916 err = -ENOTCONN; 917 goto out; 918 } 919 920 /* initialize defaults */ 921 cmsg_done = 0; /* check for duplicate headers */ 922 txmsg.class = 0; 923 924 /* iterate over control messages */ 925 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; 926 cmsg = CMSG_NXTHDR(msg, cmsg)) { 927 928 if (!CMSG_OK(msg, cmsg)) { 929 err = -EINVAL; 930 goto out; 931 } 932 933 if (cmsg->cmsg_level != SOL_IUCV) 934 continue; 935 936 if (cmsg->cmsg_type & cmsg_done) { 937 err = -EINVAL; 938 goto out; 939 } 940 cmsg_done |= cmsg->cmsg_type; 941 942 switch (cmsg->cmsg_type) { 943 case SCM_IUCV_TRGCLS: 944 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 945 err = -EINVAL; 946 goto out; 947 } 948 949 /* set iucv message target class */ 950 memcpy(&txmsg.class, 951 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 952 953 break; 954 955 default: 956 err = -EINVAL; 957 goto out; 958 break; 959 } 960 } 961 962 /* allocate one skb for each iucv message: 963 * this is fine for SOCK_SEQPACKET (unless we want to support 964 * segmented records using the MSG_EOR flag), but 965 * for SOCK_STREAM we might want to improve it in future */ 966 skb = sock_alloc_send_skb(sk, len, noblock, &err); 967 if (!skb) 968 goto out; 969 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { 970 err = -EFAULT; 971 goto fail; 972 } 973 974 /* wait if outstanding messages for iucv path has reached */ 975 timeo = sock_sndtimeo(sk, noblock); 976 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 977 if (err) 978 goto fail; 979 980 /* return -ECONNRESET if the socket is no longer connected */ 981 if (sk->sk_state != IUCV_CONNECTED) { 982 err = -ECONNRESET; 983 goto fail; 984 } 985 986 /* increment and save iucv message tag for msg_completion cbk */ 987 txmsg.tag = iucv->send_tag++; 988 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); 989 skb_queue_tail(&iucv->send_skb_q, skb); 990 991 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) 992 && skb->len <= 7) { 993 err = iucv_send_iprm(iucv->path, &txmsg, skb); 994 995 /* on success: there is no message_complete callback 996 * for an IPRMDATA msg; remove skb from send queue */ 997 if (err == 0) { 998 skb_unlink(skb, &iucv->send_skb_q); 999 kfree_skb(skb); 1000 } 1001 1002 /* this error should never happen since the 1003 * IUCV_IPRMDATA path flag is set... sever path */ 1004 if (err == 0x15) { 1005 iucv_path_sever(iucv->path, NULL); 1006 skb_unlink(skb, &iucv->send_skb_q); 1007 err = -EPIPE; 1008 goto fail; 1009 } 1010 } else 1011 err = iucv_message_send(iucv->path, &txmsg, 0, 0, 1012 (void *) skb->data, skb->len); 1013 if (err) { 1014 if (err == 3) { 1015 user_id[8] = 0; 1016 memcpy(user_id, iucv->dst_user_id, 8); 1017 appl_id[8] = 0; 1018 memcpy(appl_id, iucv->dst_name, 8); 1019 pr_err("Application %s on z/VM guest %s" 1020 " exceeds message limit\n", 1021 appl_id, user_id); 1022 err = -EAGAIN; 1023 } else 1024 err = -EPIPE; 1025 skb_unlink(skb, &iucv->send_skb_q); 1026 goto fail; 1027 } 1028 1029 release_sock(sk); 1030 return len; 1031 1032fail: 1033 kfree_skb(skb); 1034out: 1035 release_sock(sk); 1036 return err; 1037} 1038 1039/* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's 1040 * 1041 * Locking: must be called with message_q.lock held 1042 */ 1043static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) 1044{ 1045 int dataleft, size, copied = 0; 1046 struct sk_buff *nskb; 1047 1048 dataleft = len; 1049 while (dataleft) { 1050 if (dataleft >= sk->sk_rcvbuf / 4) 1051 size = sk->sk_rcvbuf / 4; 1052 else 1053 size = dataleft; 1054 1055 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); 1056 if (!nskb) 1057 return -ENOMEM; 1058 1059 /* copy target class to control buffer of new skb */ 1060 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); 1061 1062 /* copy data fragment */ 1063 memcpy(nskb->data, skb->data + copied, size); 1064 copied += size; 1065 dataleft -= size; 1066 1067 skb_reset_transport_header(nskb); 1068 skb_reset_network_header(nskb); 1069 nskb->len = size; 1070 1071 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); 1072 } 1073 1074 return 0; 1075} 1076 1077/* iucv_process_message() - Receive a single outstanding IUCV message 1078 * 1079 * Locking: must be called with message_q.lock held 1080 */ 1081static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1082 struct iucv_path *path, 1083 struct iucv_message *msg) 1084{ 1085 int rc; 1086 unsigned int len; 1087 1088 len = iucv_msg_length(msg); 1089 1090 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1091 /* Note: the first 4 bytes are reserved for msg tag */ 1092 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); 1093 1094 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1095 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1096 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1097 skb->data = NULL; 1098 skb->len = 0; 1099 } 1100 } else { 1101 rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA, 1102 skb->data, len, NULL); 1103 if (rc) { 1104 kfree_skb(skb); 1105 return; 1106 } 1107 /* we need to fragment iucv messages for SOCK_STREAM only; 1108 * for SOCK_SEQPACKET, it is only relevant if we support 1109 * record segmentation using MSG_EOR (see also recvmsg()) */ 1110 if (sk->sk_type == SOCK_STREAM && 1111 skb->truesize >= sk->sk_rcvbuf / 4) { 1112 rc = iucv_fragment_skb(sk, skb, len); 1113 kfree_skb(skb); 1114 skb = NULL; 1115 if (rc) { 1116 iucv_path_sever(path, NULL); 1117 return; 1118 } 1119 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); 1120 } else { 1121 skb_reset_transport_header(skb); 1122 skb_reset_network_header(skb); 1123 skb->len = len; 1124 } 1125 } 1126 1127 if (sock_queue_rcv_skb(sk, skb)) 1128 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); 1129} 1130 1131/* iucv_process_message_q() - Process outstanding IUCV messages 1132 * 1133 * Locking: must be called with message_q.lock held 1134 */ 1135static void iucv_process_message_q(struct sock *sk) 1136{ 1137 struct iucv_sock *iucv = iucv_sk(sk); 1138 struct sk_buff *skb; 1139 struct sock_msg_q *p, *n; 1140 1141 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1142 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); 1143 if (!skb) 1144 break; 1145 iucv_process_message(sk, skb, p->path, &p->msg); 1146 list_del(&p->list); 1147 kfree(p); 1148 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1149 break; 1150 } 1151} 1152 1153static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, 1154 struct msghdr *msg, size_t len, int flags) 1155{ 1156 int noblock = flags & MSG_DONTWAIT; 1157 struct sock *sk = sock->sk; 1158 struct iucv_sock *iucv = iucv_sk(sk); 1159 unsigned int copied, rlen; 1160 struct sk_buff *skb, *rskb, *cskb; 1161 int err = 0; 1162 1163 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && 1164 skb_queue_empty(&iucv->backlog_skb_q) && 1165 skb_queue_empty(&sk->sk_receive_queue) && 1166 list_empty(&iucv->message_q.list)) 1167 return 0; 1168 1169 if (flags & (MSG_OOB)) 1170 return -EOPNOTSUPP; 1171 1172 /* receive/dequeue next skb: 1173 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1174 skb = skb_recv_datagram(sk, flags, noblock, &err); 1175 if (!skb) { 1176 if (sk->sk_shutdown & RCV_SHUTDOWN) 1177 return 0; 1178 return err; 1179 } 1180 1181 rlen = skb->len; /* real length of skb */ 1182 copied = min_t(unsigned int, rlen, len); 1183 1184 cskb = skb; 1185 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { 1186 if (!(flags & MSG_PEEK)) 1187 skb_queue_head(&sk->sk_receive_queue, skb); 1188 return -EFAULT; 1189 } 1190 1191 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1192 if (sk->sk_type == SOCK_SEQPACKET) { 1193 if (copied < rlen) 1194 msg->msg_flags |= MSG_TRUNC; 1195 /* each iucv message contains a complete record */ 1196 msg->msg_flags |= MSG_EOR; 1197 } 1198 1199 /* create control message to store iucv msg target class: 1200 * get the trgcls from the control buffer of the skb due to 1201 * fragmentation of original iucv message. */ 1202 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1203 CB_TRGCLS_LEN, CB_TRGCLS(skb)); 1204 if (err) { 1205 if (!(flags & MSG_PEEK)) 1206 skb_queue_head(&sk->sk_receive_queue, skb); 1207 return err; 1208 } 1209 1210 /* Mark read part of skb as used */ 1211 if (!(flags & MSG_PEEK)) { 1212 1213 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1214 if (sk->sk_type == SOCK_STREAM) { 1215 skb_pull(skb, copied); 1216 if (skb->len) { 1217 skb_queue_head(&sk->sk_receive_queue, skb); 1218 goto done; 1219 } 1220 } 1221 1222 kfree_skb(skb); 1223 1224 /* Queue backlog skbs */ 1225 spin_lock_bh(&iucv->message_q.lock); 1226 rskb = skb_dequeue(&iucv->backlog_skb_q); 1227 while (rskb) { 1228 if (sock_queue_rcv_skb(sk, rskb)) { 1229 skb_queue_head(&iucv->backlog_skb_q, 1230 rskb); 1231 break; 1232 } else { 1233 rskb = skb_dequeue(&iucv->backlog_skb_q); 1234 } 1235 } 1236 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1237 if (!list_empty(&iucv->message_q.list)) 1238 iucv_process_message_q(sk); 1239 } 1240 spin_unlock_bh(&iucv->message_q.lock); 1241 } 1242 1243done: 1244 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1245 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1246 copied = rlen; 1247 1248 return copied; 1249} 1250 1251static inline unsigned int iucv_accept_poll(struct sock *parent) 1252{ 1253 struct iucv_sock *isk, *n; 1254 struct sock *sk; 1255 1256 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1257 sk = (struct sock *) isk; 1258 1259 if (sk->sk_state == IUCV_CONNECTED) 1260 return POLLIN | POLLRDNORM; 1261 } 1262 1263 return 0; 1264} 1265 1266unsigned int iucv_sock_poll(struct file *file, struct socket *sock, 1267 poll_table *wait) 1268{ 1269 struct sock *sk = sock->sk; 1270 unsigned int mask = 0; 1271 1272 sock_poll_wait(file, sk->sk_sleep, wait); 1273 1274 if (sk->sk_state == IUCV_LISTEN) 1275 return iucv_accept_poll(sk); 1276 1277 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1278 mask |= POLLERR; 1279 1280 if (sk->sk_shutdown & RCV_SHUTDOWN) 1281 mask |= POLLRDHUP; 1282 1283 if (sk->sk_shutdown == SHUTDOWN_MASK) 1284 mask |= POLLHUP; 1285 1286 if (!skb_queue_empty(&sk->sk_receive_queue) || 1287 (sk->sk_shutdown & RCV_SHUTDOWN)) 1288 mask |= POLLIN | POLLRDNORM; 1289 1290 if (sk->sk_state == IUCV_CLOSED) 1291 mask |= POLLHUP; 1292 1293 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) 1294 mask |= POLLIN; 1295 1296 if (sock_writeable(sk)) 1297 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 1298 else 1299 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1300 1301 return mask; 1302} 1303 1304static int iucv_sock_shutdown(struct socket *sock, int how) 1305{ 1306 struct sock *sk = sock->sk; 1307 struct iucv_sock *iucv = iucv_sk(sk); 1308 struct iucv_message txmsg; 1309 int err = 0; 1310 1311 how++; 1312 1313 if ((how & ~SHUTDOWN_MASK) || !how) 1314 return -EINVAL; 1315 1316 lock_sock(sk); 1317 switch (sk->sk_state) { 1318 case IUCV_DISCONN: 1319 case IUCV_CLOSING: 1320 case IUCV_SEVERED: 1321 case IUCV_CLOSED: 1322 err = -ENOTCONN; 1323 goto fail; 1324 1325 default: 1326 sk->sk_shutdown |= how; 1327 break; 1328 } 1329 1330 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1331 txmsg.class = 0; 1332 txmsg.tag = 0; 1333 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0, 1334 (void *) iprm_shutdown, 8); 1335 if (err) { 1336 switch (err) { 1337 case 1: 1338 err = -ENOTCONN; 1339 break; 1340 case 2: 1341 err = -ECONNRESET; 1342 break; 1343 default: 1344 err = -ENOTCONN; 1345 break; 1346 } 1347 } 1348 } 1349 1350 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1351 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL); 1352 if (err) 1353 err = -ENOTCONN; 1354 1355 skb_queue_purge(&sk->sk_receive_queue); 1356 } 1357 1358 /* Wake up anyone sleeping in poll */ 1359 sk->sk_state_change(sk); 1360 1361fail: 1362 release_sock(sk); 1363 return err; 1364} 1365 1366static int iucv_sock_release(struct socket *sock) 1367{ 1368 struct sock *sk = sock->sk; 1369 int err = 0; 1370 1371 if (!sk) 1372 return 0; 1373 1374 iucv_sock_close(sk); 1375 1376 /* Unregister with IUCV base support */ 1377 if (iucv_sk(sk)->path) { 1378 iucv_path_sever(iucv_sk(sk)->path, NULL); 1379 iucv_path_free(iucv_sk(sk)->path); 1380 iucv_sk(sk)->path = NULL; 1381 } 1382 1383 sock_orphan(sk); 1384 iucv_sock_kill(sk); 1385 return err; 1386} 1387 1388/* getsockopt and setsockopt */ 1389static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1390 char __user *optval, int optlen) 1391{ 1392 struct sock *sk = sock->sk; 1393 struct iucv_sock *iucv = iucv_sk(sk); 1394 int val; 1395 int rc; 1396 1397 if (level != SOL_IUCV) 1398 return -ENOPROTOOPT; 1399 1400 if (optlen < sizeof(int)) 1401 return -EINVAL; 1402 1403 if (get_user(val, (int __user *) optval)) 1404 return -EFAULT; 1405 1406 rc = 0; 1407 1408 lock_sock(sk); 1409 switch (optname) { 1410 case SO_IPRMDATA_MSG: 1411 if (val) 1412 iucv->flags |= IUCV_IPRMDATA; 1413 else 1414 iucv->flags &= ~IUCV_IPRMDATA; 1415 break; 1416 case SO_MSGLIMIT: 1417 switch (sk->sk_state) { 1418 case IUCV_OPEN: 1419 case IUCV_BOUND: 1420 if (val < 1 || val > (u16)(~0)) 1421 rc = -EINVAL; 1422 else 1423 iucv->msglimit = val; 1424 break; 1425 default: 1426 rc = -EINVAL; 1427 break; 1428 } 1429 break; 1430 default: 1431 rc = -ENOPROTOOPT; 1432 break; 1433 } 1434 release_sock(sk); 1435 1436 return rc; 1437} 1438 1439static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1440 char __user *optval, int __user *optlen) 1441{ 1442 struct sock *sk = sock->sk; 1443 struct iucv_sock *iucv = iucv_sk(sk); 1444 int val, len; 1445 1446 if (level != SOL_IUCV) 1447 return -ENOPROTOOPT; 1448 1449 if (get_user(len, optlen)) 1450 return -EFAULT; 1451 1452 if (len < 0) 1453 return -EINVAL; 1454 1455 len = min_t(unsigned int, len, sizeof(int)); 1456 1457 switch (optname) { 1458 case SO_IPRMDATA_MSG: 1459 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1460 break; 1461 case SO_MSGLIMIT: 1462 lock_sock(sk); 1463 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1464 : iucv->msglimit; /* default */ 1465 release_sock(sk); 1466 break; 1467 default: 1468 return -ENOPROTOOPT; 1469 } 1470 1471 if (put_user(len, optlen)) 1472 return -EFAULT; 1473 if (copy_to_user(optval, &val, len)) 1474 return -EFAULT; 1475 1476 return 0; 1477} 1478 1479 1480/* Callback wrappers - called from iucv base support */ 1481static int iucv_callback_connreq(struct iucv_path *path, 1482 u8 ipvmid[8], u8 ipuser[16]) 1483{ 1484 unsigned char user_data[16]; 1485 unsigned char nuser_data[16]; 1486 unsigned char src_name[8]; 1487 struct hlist_node *node; 1488 struct sock *sk, *nsk; 1489 struct iucv_sock *iucv, *niucv; 1490 int err; 1491 1492 memcpy(src_name, ipuser, 8); 1493 EBCASC(src_name, 8); 1494 /* Find out if this path belongs to af_iucv. */ 1495 read_lock(&iucv_sk_list.lock); 1496 iucv = NULL; 1497 sk = NULL; 1498 sk_for_each(sk, node, &iucv_sk_list.head) 1499 if (sk->sk_state == IUCV_LISTEN && 1500 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1501 /* 1502 * Found a listening socket with 1503 * src_name == ipuser[0-7]. 1504 */ 1505 iucv = iucv_sk(sk); 1506 break; 1507 } 1508 read_unlock(&iucv_sk_list.lock); 1509 if (!iucv) 1510 /* No socket found, not one of our paths. */ 1511 return -EINVAL; 1512 1513 bh_lock_sock(sk); 1514 1515 /* Check if parent socket is listening */ 1516 low_nmcpy(user_data, iucv->src_name); 1517 high_nmcpy(user_data, iucv->dst_name); 1518 ASCEBC(user_data, sizeof(user_data)); 1519 if (sk->sk_state != IUCV_LISTEN) { 1520 err = iucv_path_sever(path, user_data); 1521 iucv_path_free(path); 1522 goto fail; 1523 } 1524 1525 /* Check for backlog size */ 1526 if (sk_acceptq_is_full(sk)) { 1527 err = iucv_path_sever(path, user_data); 1528 iucv_path_free(path); 1529 goto fail; 1530 } 1531 1532 /* Create the new socket */ 1533 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); 1534 if (!nsk) { 1535 err = iucv_path_sever(path, user_data); 1536 iucv_path_free(path); 1537 goto fail; 1538 } 1539 1540 niucv = iucv_sk(nsk); 1541 iucv_sock_init(nsk, sk); 1542 1543 /* Set the new iucv_sock */ 1544 memcpy(niucv->dst_name, ipuser + 8, 8); 1545 EBCASC(niucv->dst_name, 8); 1546 memcpy(niucv->dst_user_id, ipvmid, 8); 1547 memcpy(niucv->src_name, iucv->src_name, 8); 1548 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1549 niucv->path = path; 1550 1551 /* Call iucv_accept */ 1552 high_nmcpy(nuser_data, ipuser + 8); 1553 memcpy(nuser_data + 8, niucv->src_name, 8); 1554 ASCEBC(nuser_data + 8, 8); 1555 1556 /* set message limit for path based on msglimit of accepting socket */ 1557 niucv->msglimit = iucv->msglimit; 1558 path->msglim = iucv->msglimit; 1559 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk); 1560 if (err) { 1561 err = iucv_path_sever(path, user_data); 1562 iucv_path_free(path); 1563 iucv_sock_kill(nsk); 1564 goto fail; 1565 } 1566 1567 iucv_accept_enqueue(sk, nsk); 1568 1569 /* Wake up accept */ 1570 nsk->sk_state = IUCV_CONNECTED; 1571 sk->sk_data_ready(sk, 1); 1572 err = 0; 1573fail: 1574 bh_unlock_sock(sk); 1575 return 0; 1576} 1577 1578static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1579{ 1580 struct sock *sk = path->private; 1581 1582 sk->sk_state = IUCV_CONNECTED; 1583 sk->sk_state_change(sk); 1584} 1585 1586static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1587{ 1588 struct sock *sk = path->private; 1589 struct iucv_sock *iucv = iucv_sk(sk); 1590 struct sk_buff *skb; 1591 struct sock_msg_q *save_msg; 1592 int len; 1593 1594 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1595 iucv_message_reject(path, msg); 1596 return; 1597 } 1598 1599 spin_lock(&iucv->message_q.lock); 1600 1601 if (!list_empty(&iucv->message_q.list) || 1602 !skb_queue_empty(&iucv->backlog_skb_q)) 1603 goto save_message; 1604 1605 len = atomic_read(&sk->sk_rmem_alloc); 1606 len += iucv_msg_length(msg) + sizeof(struct sk_buff); 1607 if (len > sk->sk_rcvbuf) 1608 goto save_message; 1609 1610 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); 1611 if (!skb) 1612 goto save_message; 1613 1614 iucv_process_message(sk, skb, path, msg); 1615 goto out_unlock; 1616 1617save_message: 1618 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1619 if (!save_msg) 1620 return; 1621 save_msg->path = path; 1622 save_msg->msg = *msg; 1623 1624 list_add_tail(&save_msg->list, &iucv->message_q.list); 1625 1626out_unlock: 1627 spin_unlock(&iucv->message_q.lock); 1628} 1629 1630static void iucv_callback_txdone(struct iucv_path *path, 1631 struct iucv_message *msg) 1632{ 1633 struct sock *sk = path->private; 1634 struct sk_buff *this = NULL; 1635 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1636 struct sk_buff *list_skb = list->next; 1637 unsigned long flags; 1638 1639 if (!skb_queue_empty(list)) { 1640 spin_lock_irqsave(&list->lock, flags); 1641 1642 while (list_skb != (struct sk_buff *)list) { 1643 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { 1644 this = list_skb; 1645 break; 1646 } 1647 list_skb = list_skb->next; 1648 } 1649 if (this) 1650 __skb_unlink(this, list); 1651 1652 spin_unlock_irqrestore(&list->lock, flags); 1653 1654 if (this) { 1655 kfree_skb(this); 1656 /* wake up any process waiting for sending */ 1657 iucv_sock_wake_msglim(sk); 1658 } 1659 } 1660 BUG_ON(!this); 1661 1662 if (sk->sk_state == IUCV_CLOSING) { 1663 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1664 sk->sk_state = IUCV_CLOSED; 1665 sk->sk_state_change(sk); 1666 } 1667 } 1668 1669} 1670 1671static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1672{ 1673 struct sock *sk = path->private; 1674 1675 if (!list_empty(&iucv_sk(sk)->accept_q)) 1676 sk->sk_state = IUCV_SEVERED; 1677 else 1678 sk->sk_state = IUCV_DISCONN; 1679 1680 sk->sk_state_change(sk); 1681} 1682 1683/* called if the other communication side shuts down its RECV direction; 1684 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1685 */ 1686static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1687{ 1688 struct sock *sk = path->private; 1689 1690 bh_lock_sock(sk); 1691 if (sk->sk_state != IUCV_CLOSED) { 1692 sk->sk_shutdown |= SEND_SHUTDOWN; 1693 sk->sk_state_change(sk); 1694 } 1695 bh_unlock_sock(sk); 1696} 1697 1698static const struct proto_ops iucv_sock_ops = { 1699 .family = PF_IUCV, 1700 .owner = THIS_MODULE, 1701 .release = iucv_sock_release, 1702 .bind = iucv_sock_bind, 1703 .connect = iucv_sock_connect, 1704 .listen = iucv_sock_listen, 1705 .accept = iucv_sock_accept, 1706 .getname = iucv_sock_getname, 1707 .sendmsg = iucv_sock_sendmsg, 1708 .recvmsg = iucv_sock_recvmsg, 1709 .poll = iucv_sock_poll, 1710 .ioctl = sock_no_ioctl, 1711 .mmap = sock_no_mmap, 1712 .socketpair = sock_no_socketpair, 1713 .shutdown = iucv_sock_shutdown, 1714 .setsockopt = iucv_sock_setsockopt, 1715 .getsockopt = iucv_sock_getsockopt, 1716}; 1717 1718static struct net_proto_family iucv_sock_family_ops = { 1719 .family = AF_IUCV, 1720 .owner = THIS_MODULE, 1721 .create = iucv_sock_create, 1722}; 1723 1724static int __init afiucv_init(void) 1725{ 1726 int err; 1727 1728 if (!MACHINE_IS_VM) { 1729 pr_err("The af_iucv module cannot be loaded" 1730 " without z/VM\n"); 1731 err = -EPROTONOSUPPORT; 1732 goto out; 1733 } 1734 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 1735 if (unlikely(err)) { 1736 WARN_ON(err); 1737 err = -EPROTONOSUPPORT; 1738 goto out; 1739 } 1740 1741 err = iucv_register(&af_iucv_handler, 0); 1742 if (err) 1743 goto out; 1744 err = proto_register(&iucv_proto, 0); 1745 if (err) 1746 goto out_iucv; 1747 err = sock_register(&iucv_sock_family_ops); 1748 if (err) 1749 goto out_proto; 1750 /* establish dummy device */ 1751 err = driver_register(&af_iucv_driver); 1752 if (err) 1753 goto out_sock; 1754 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 1755 if (!af_iucv_dev) { 1756 err = -ENOMEM; 1757 goto out_driver; 1758 } 1759 dev_set_name(af_iucv_dev, "af_iucv"); 1760 af_iucv_dev->bus = &iucv_bus; 1761 af_iucv_dev->parent = iucv_root; 1762 af_iucv_dev->release = (void (*)(struct device *))kfree; 1763 af_iucv_dev->driver = &af_iucv_driver; 1764 err = device_register(af_iucv_dev); 1765 if (err) 1766 goto out_driver; 1767 1768 return 0; 1769 1770out_driver: 1771 driver_unregister(&af_iucv_driver); 1772out_sock: 1773 sock_unregister(PF_IUCV); 1774out_proto: 1775 proto_unregister(&iucv_proto); 1776out_iucv: 1777 iucv_unregister(&af_iucv_handler, 0); 1778out: 1779 return err; 1780} 1781 1782static void __exit afiucv_exit(void) 1783{ 1784 device_unregister(af_iucv_dev); 1785 driver_unregister(&af_iucv_driver); 1786 sock_unregister(PF_IUCV); 1787 proto_unregister(&iucv_proto); 1788 iucv_unregister(&af_iucv_handler, 0); 1789} 1790 1791module_init(afiucv_init); 1792module_exit(afiucv_exit); 1793 1794MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 1795MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 1796MODULE_VERSION(VERSION); 1797MODULE_LICENSE("GPL"); 1798MODULE_ALIAS_NETPROTO(PF_IUCV); 1799