af_iucv.c revision aac6399c6a08334282653a86ce760cff3e1755b7
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/af_iucv.h> 31 32#define VERSION "1.2" 33 34static char iucv_userid[80]; 35 36static const struct proto_ops iucv_sock_ops; 37 38static struct proto iucv_proto = { 39 .name = "AF_IUCV", 40 .owner = THIS_MODULE, 41 .obj_size = sizeof(struct iucv_sock), 42}; 43 44static struct iucv_interface *pr_iucv; 45 46/* special AF_IUCV IPRM messages */ 47static const u8 iprm_shutdown[8] = 48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 49 50#define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) 51 52/* macros to set/get socket control buffer at correct offset */ 53#define CB_TAG(skb) ((skb)->cb) /* iucv message tag */ 54#define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag)) 55#define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */ 56#define CB_TRGCLS_LEN (TRGCLS_SIZE) 57 58#define __iucv_sock_wait(sk, condition, timeo, ret) \ 59do { \ 60 DEFINE_WAIT(__wait); \ 61 long __timeo = timeo; \ 62 ret = 0; \ 63 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 64 while (!(condition)) { \ 65 if (!__timeo) { \ 66 ret = -EAGAIN; \ 67 break; \ 68 } \ 69 if (signal_pending(current)) { \ 70 ret = sock_intr_errno(__timeo); \ 71 break; \ 72 } \ 73 release_sock(sk); \ 74 __timeo = schedule_timeout(__timeo); \ 75 lock_sock(sk); \ 76 ret = sock_error(sk); \ 77 if (ret) \ 78 break; \ 79 } \ 80 finish_wait(sk_sleep(sk), &__wait); \ 81} while (0) 82 83#define iucv_sock_wait(sk, condition, timeo) \ 84({ \ 85 int __ret = 0; \ 86 if (!(condition)) \ 87 __iucv_sock_wait(sk, condition, timeo, __ret); \ 88 __ret; \ 89}) 90 91static void iucv_sock_kill(struct sock *sk); 92static void iucv_sock_close(struct sock *sk); 93 94static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 95 struct packet_type *pt, struct net_device *orig_dev); 96static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 97 struct sk_buff *skb, u8 flags); 98static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); 99 100/* Call Back functions */ 101static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 102static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 103static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); 104static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], 105 u8 ipuser[16]); 106static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); 107static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); 108 109static struct iucv_sock_list iucv_sk_list = { 110 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 111 .autobind_name = ATOMIC_INIT(0) 112}; 113 114static struct iucv_handler af_iucv_handler = { 115 .path_pending = iucv_callback_connreq, 116 .path_complete = iucv_callback_connack, 117 .path_severed = iucv_callback_connrej, 118 .message_pending = iucv_callback_rx, 119 .message_complete = iucv_callback_txdone, 120 .path_quiesced = iucv_callback_shutdown, 121}; 122 123static inline void high_nmcpy(unsigned char *dst, char *src) 124{ 125 memcpy(dst, src, 8); 126} 127 128static inline void low_nmcpy(unsigned char *dst, char *src) 129{ 130 memcpy(&dst[8], src, 8); 131} 132 133static void iucv_skb_queue_purge(struct sk_buff_head *list) 134{ 135 struct sk_buff *skb; 136 137 while ((skb = skb_dequeue(list)) != NULL) { 138 if (skb->dev) 139 dev_put(skb->dev); 140 kfree_skb(skb); 141 } 142} 143 144static int afiucv_pm_prepare(struct device *dev) 145{ 146#ifdef CONFIG_PM_DEBUG 147 printk(KERN_WARNING "afiucv_pm_prepare\n"); 148#endif 149 return 0; 150} 151 152static void afiucv_pm_complete(struct device *dev) 153{ 154#ifdef CONFIG_PM_DEBUG 155 printk(KERN_WARNING "afiucv_pm_complete\n"); 156#endif 157} 158 159/** 160 * afiucv_pm_freeze() - Freeze PM callback 161 * @dev: AFIUCV dummy device 162 * 163 * Sever all established IUCV communication pathes 164 */ 165static int afiucv_pm_freeze(struct device *dev) 166{ 167 struct iucv_sock *iucv; 168 struct sock *sk; 169 struct hlist_node *node; 170 int err = 0; 171 172#ifdef CONFIG_PM_DEBUG 173 printk(KERN_WARNING "afiucv_pm_freeze\n"); 174#endif 175 read_lock(&iucv_sk_list.lock); 176 sk_for_each(sk, node, &iucv_sk_list.head) { 177 iucv = iucv_sk(sk); 178 iucv_skb_queue_purge(&iucv->send_skb_q); 179 skb_queue_purge(&iucv->backlog_skb_q); 180 switch (sk->sk_state) { 181 case IUCV_DISCONN: 182 case IUCV_CLOSING: 183 case IUCV_CONNECTED: 184 if (iucv->path) { 185 err = pr_iucv->path_sever(iucv->path, NULL); 186 iucv_path_free(iucv->path); 187 iucv->path = NULL; 188 } 189 break; 190 case IUCV_OPEN: 191 case IUCV_BOUND: 192 case IUCV_LISTEN: 193 case IUCV_CLOSED: 194 default: 195 break; 196 } 197 } 198 read_unlock(&iucv_sk_list.lock); 199 return err; 200} 201 202/** 203 * afiucv_pm_restore_thaw() - Thaw and restore PM callback 204 * @dev: AFIUCV dummy device 205 * 206 * socket clean up after freeze 207 */ 208static int afiucv_pm_restore_thaw(struct device *dev) 209{ 210 struct sock *sk; 211 struct hlist_node *node; 212 213#ifdef CONFIG_PM_DEBUG 214 printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); 215#endif 216 read_lock(&iucv_sk_list.lock); 217 sk_for_each(sk, node, &iucv_sk_list.head) { 218 switch (sk->sk_state) { 219 case IUCV_CONNECTED: 220 sk->sk_err = EPIPE; 221 sk->sk_state = IUCV_DISCONN; 222 sk->sk_state_change(sk); 223 break; 224 case IUCV_DISCONN: 225 case IUCV_CLOSING: 226 case IUCV_LISTEN: 227 case IUCV_BOUND: 228 case IUCV_OPEN: 229 default: 230 break; 231 } 232 } 233 read_unlock(&iucv_sk_list.lock); 234 return 0; 235} 236 237static const struct dev_pm_ops afiucv_pm_ops = { 238 .prepare = afiucv_pm_prepare, 239 .complete = afiucv_pm_complete, 240 .freeze = afiucv_pm_freeze, 241 .thaw = afiucv_pm_restore_thaw, 242 .restore = afiucv_pm_restore_thaw, 243}; 244 245static struct device_driver af_iucv_driver = { 246 .owner = THIS_MODULE, 247 .name = "afiucv", 248 .bus = NULL, 249 .pm = &afiucv_pm_ops, 250}; 251 252/* dummy device used as trigger for PM functions */ 253static struct device *af_iucv_dev; 254 255/** 256 * iucv_msg_length() - Returns the length of an iucv message. 257 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 258 * 259 * The function returns the length of the specified iucv message @msg of data 260 * stored in a buffer and of data stored in the parameter list (PRMDATA). 261 * 262 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 263 * data: 264 * PRMDATA[0..6] socket data (max 7 bytes); 265 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 266 * 267 * The socket data length is computed by subtracting the socket data length 268 * value from 0xFF. 269 * If the socket data len is greater 7, then PRMDATA can be used for special 270 * notifications (see iucv_sock_shutdown); and further, 271 * if the socket data len is > 7, the function returns 8. 272 * 273 * Use this function to allocate socket buffers to store iucv message data. 274 */ 275static inline size_t iucv_msg_length(struct iucv_message *msg) 276{ 277 size_t datalen; 278 279 if (msg->flags & IUCV_IPRMDATA) { 280 datalen = 0xff - msg->rmmsg[7]; 281 return (datalen < 8) ? datalen : 8; 282 } 283 return msg->length; 284} 285 286/** 287 * iucv_sock_in_state() - check for specific states 288 * @sk: sock structure 289 * @state: first iucv sk state 290 * @state: second iucv sk state 291 * 292 * Returns true if the socket in either in the first or second state. 293 */ 294static int iucv_sock_in_state(struct sock *sk, int state, int state2) 295{ 296 return (sk->sk_state == state || sk->sk_state == state2); 297} 298 299/** 300 * iucv_below_msglim() - function to check if messages can be sent 301 * @sk: sock structure 302 * 303 * Returns true if the send queue length is lower than the message limit. 304 * Always returns true if the socket is not connected (no iucv path for 305 * checking the message limit). 306 */ 307static inline int iucv_below_msglim(struct sock *sk) 308{ 309 struct iucv_sock *iucv = iucv_sk(sk); 310 311 if (sk->sk_state != IUCV_CONNECTED) 312 return 1; 313 if (iucv->transport == AF_IUCV_TRANS_IUCV) 314 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); 315 else 316 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 317 (atomic_read(&iucv->pendings) <= 0)); 318} 319 320/** 321 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 322 */ 323static void iucv_sock_wake_msglim(struct sock *sk) 324{ 325 struct socket_wq *wq; 326 327 rcu_read_lock(); 328 wq = rcu_dereference(sk->sk_wq); 329 if (wq_has_sleeper(wq)) 330 wake_up_interruptible_all(&wq->wait); 331 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 332 rcu_read_unlock(); 333} 334 335/** 336 * afiucv_hs_send() - send a message through HiperSockets transport 337 */ 338static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 339 struct sk_buff *skb, u8 flags) 340{ 341 struct net *net = sock_net(sock); 342 struct iucv_sock *iucv = iucv_sk(sock); 343 struct af_iucv_trans_hdr *phs_hdr; 344 struct sk_buff *nskb; 345 int err, confirm_recv = 0; 346 347 memset(skb->head, 0, ETH_HLEN); 348 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, 349 sizeof(struct af_iucv_trans_hdr)); 350 skb_reset_mac_header(skb); 351 skb_reset_network_header(skb); 352 skb_push(skb, ETH_HLEN); 353 skb_reset_mac_header(skb); 354 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); 355 356 phs_hdr->magic = ETH_P_AF_IUCV; 357 phs_hdr->version = 1; 358 phs_hdr->flags = flags; 359 if (flags == AF_IUCV_FLAG_SYN) 360 phs_hdr->window = iucv->msglimit; 361 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 362 confirm_recv = atomic_read(&iucv->msg_recv); 363 phs_hdr->window = confirm_recv; 364 if (confirm_recv) 365 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 366 } 367 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 368 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 369 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 370 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 371 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 372 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 373 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 374 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 375 if (imsg) 376 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 377 378 skb->dev = dev_get_by_index(net, sock->sk_bound_dev_if); 379 if (!skb->dev) 380 return -ENODEV; 381 if (!(skb->dev->flags & IFF_UP)) 382 return -ENETDOWN; 383 if (skb->len > skb->dev->mtu) { 384 if (sock->sk_type == SOCK_SEQPACKET) 385 return -EMSGSIZE; 386 else 387 skb_trim(skb, skb->dev->mtu); 388 } 389 skb->protocol = ETH_P_AF_IUCV; 390 skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF; 391 nskb = skb_clone(skb, GFP_ATOMIC); 392 if (!nskb) 393 return -ENOMEM; 394 skb_queue_tail(&iucv->send_skb_q, nskb); 395 err = dev_queue_xmit(skb); 396 if (err) { 397 skb_unlink(nskb, &iucv->send_skb_q); 398 dev_put(nskb->dev); 399 kfree_skb(nskb); 400 } else { 401 atomic_sub(confirm_recv, &iucv->msg_recv); 402 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 403 } 404 return err; 405} 406 407static struct sock *__iucv_get_sock_by_name(char *nm) 408{ 409 struct sock *sk; 410 struct hlist_node *node; 411 412 sk_for_each(sk, node, &iucv_sk_list.head) 413 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 414 return sk; 415 416 return NULL; 417} 418 419static void iucv_sock_destruct(struct sock *sk) 420{ 421 skb_queue_purge(&sk->sk_receive_queue); 422 skb_queue_purge(&sk->sk_write_queue); 423} 424 425/* Cleanup Listen */ 426static void iucv_sock_cleanup_listen(struct sock *parent) 427{ 428 struct sock *sk; 429 430 /* Close non-accepted connections */ 431 while ((sk = iucv_accept_dequeue(parent, NULL))) { 432 iucv_sock_close(sk); 433 iucv_sock_kill(sk); 434 } 435 436 parent->sk_state = IUCV_CLOSED; 437} 438 439/* Kill socket (only if zapped and orphaned) */ 440static void iucv_sock_kill(struct sock *sk) 441{ 442 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 443 return; 444 445 iucv_sock_unlink(&iucv_sk_list, sk); 446 sock_set_flag(sk, SOCK_DEAD); 447 sock_put(sk); 448} 449 450/* Close an IUCV socket */ 451static void iucv_sock_close(struct sock *sk) 452{ 453 unsigned char user_data[16]; 454 struct iucv_sock *iucv = iucv_sk(sk); 455 unsigned long timeo; 456 int err, blen; 457 struct sk_buff *skb; 458 459 lock_sock(sk); 460 461 switch (sk->sk_state) { 462 case IUCV_LISTEN: 463 iucv_sock_cleanup_listen(sk); 464 break; 465 466 case IUCV_CONNECTED: 467 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 468 /* send fin */ 469 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 470 skb = sock_alloc_send_skb(sk, blen, 1, &err); 471 if (skb) { 472 skb_reserve(skb, blen); 473 err = afiucv_hs_send(NULL, sk, skb, 474 AF_IUCV_FLAG_FIN); 475 } 476 sk->sk_state = IUCV_DISCONN; 477 sk->sk_state_change(sk); 478 } 479 case IUCV_DISCONN: /* fall through */ 480 sk->sk_state = IUCV_CLOSING; 481 sk->sk_state_change(sk); 482 483 if (!skb_queue_empty(&iucv->send_skb_q)) { 484 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 485 timeo = sk->sk_lingertime; 486 else 487 timeo = IUCV_DISCONN_TIMEOUT; 488 iucv_sock_wait(sk, 489 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 490 timeo); 491 } 492 493 case IUCV_CLOSING: /* fall through */ 494 sk->sk_state = IUCV_CLOSED; 495 sk->sk_state_change(sk); 496 497 if (iucv->path) { 498 low_nmcpy(user_data, iucv->src_name); 499 high_nmcpy(user_data, iucv->dst_name); 500 ASCEBC(user_data, sizeof(user_data)); 501 pr_iucv->path_sever(iucv->path, user_data); 502 iucv_path_free(iucv->path); 503 iucv->path = NULL; 504 } 505 506 sk->sk_err = ECONNRESET; 507 sk->sk_state_change(sk); 508 509 iucv_skb_queue_purge(&iucv->send_skb_q); 510 skb_queue_purge(&iucv->backlog_skb_q); 511 break; 512 513 default: 514 /* nothing to do here */ 515 break; 516 } 517 518 /* mark socket for deletion by iucv_sock_kill() */ 519 sock_set_flag(sk, SOCK_ZAPPED); 520 521 release_sock(sk); 522} 523 524static void iucv_sock_init(struct sock *sk, struct sock *parent) 525{ 526 if (parent) 527 sk->sk_type = parent->sk_type; 528} 529 530static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) 531{ 532 struct sock *sk; 533 struct iucv_sock *iucv; 534 535 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); 536 if (!sk) 537 return NULL; 538 iucv = iucv_sk(sk); 539 540 sock_init_data(sock, sk); 541 INIT_LIST_HEAD(&iucv->accept_q); 542 spin_lock_init(&iucv->accept_q_lock); 543 skb_queue_head_init(&iucv->send_skb_q); 544 INIT_LIST_HEAD(&iucv->message_q.list); 545 spin_lock_init(&iucv->message_q.lock); 546 skb_queue_head_init(&iucv->backlog_skb_q); 547 iucv->send_tag = 0; 548 atomic_set(&iucv->pendings, 0); 549 iucv->flags = 0; 550 iucv->msglimit = 0; 551 atomic_set(&iucv->msg_sent, 0); 552 atomic_set(&iucv->msg_recv, 0); 553 iucv->path = NULL; 554 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 555 memset(&iucv->src_user_id , 0, 32); 556 if (pr_iucv) 557 iucv->transport = AF_IUCV_TRANS_IUCV; 558 else 559 iucv->transport = AF_IUCV_TRANS_HIPER; 560 561 sk->sk_destruct = iucv_sock_destruct; 562 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 563 sk->sk_allocation = GFP_DMA; 564 565 sock_reset_flag(sk, SOCK_ZAPPED); 566 567 sk->sk_protocol = proto; 568 sk->sk_state = IUCV_OPEN; 569 570 iucv_sock_link(&iucv_sk_list, sk); 571 return sk; 572} 573 574/* Create an IUCV socket */ 575static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 576 int kern) 577{ 578 struct sock *sk; 579 580 if (protocol && protocol != PF_IUCV) 581 return -EPROTONOSUPPORT; 582 583 sock->state = SS_UNCONNECTED; 584 585 switch (sock->type) { 586 case SOCK_STREAM: 587 sock->ops = &iucv_sock_ops; 588 break; 589 case SOCK_SEQPACKET: 590 /* currently, proto ops can handle both sk types */ 591 sock->ops = &iucv_sock_ops; 592 break; 593 default: 594 return -ESOCKTNOSUPPORT; 595 } 596 597 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); 598 if (!sk) 599 return -ENOMEM; 600 601 iucv_sock_init(sk, NULL); 602 603 return 0; 604} 605 606void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 607{ 608 write_lock_bh(&l->lock); 609 sk_add_node(sk, &l->head); 610 write_unlock_bh(&l->lock); 611} 612 613void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 614{ 615 write_lock_bh(&l->lock); 616 sk_del_node_init(sk); 617 write_unlock_bh(&l->lock); 618} 619 620void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 621{ 622 unsigned long flags; 623 struct iucv_sock *par = iucv_sk(parent); 624 625 sock_hold(sk); 626 spin_lock_irqsave(&par->accept_q_lock, flags); 627 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 628 spin_unlock_irqrestore(&par->accept_q_lock, flags); 629 iucv_sk(sk)->parent = parent; 630 sk_acceptq_added(parent); 631} 632 633void iucv_accept_unlink(struct sock *sk) 634{ 635 unsigned long flags; 636 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 637 638 spin_lock_irqsave(&par->accept_q_lock, flags); 639 list_del_init(&iucv_sk(sk)->accept_q); 640 spin_unlock_irqrestore(&par->accept_q_lock, flags); 641 sk_acceptq_removed(iucv_sk(sk)->parent); 642 iucv_sk(sk)->parent = NULL; 643 sock_put(sk); 644} 645 646struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 647{ 648 struct iucv_sock *isk, *n; 649 struct sock *sk; 650 651 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 652 sk = (struct sock *) isk; 653 lock_sock(sk); 654 655 if (sk->sk_state == IUCV_CLOSED) { 656 iucv_accept_unlink(sk); 657 release_sock(sk); 658 continue; 659 } 660 661 if (sk->sk_state == IUCV_CONNECTED || 662 sk->sk_state == IUCV_DISCONN || 663 !newsock) { 664 iucv_accept_unlink(sk); 665 if (newsock) 666 sock_graft(sk, newsock); 667 668 release_sock(sk); 669 return sk; 670 } 671 672 release_sock(sk); 673 } 674 return NULL; 675} 676 677/* Bind an unbound socket */ 678static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 679 int addr_len) 680{ 681 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 682 struct sock *sk = sock->sk; 683 struct iucv_sock *iucv; 684 int err = 0; 685 struct net_device *dev; 686 char uid[9]; 687 688 /* Verify the input sockaddr */ 689 if (!addr || addr->sa_family != AF_IUCV) 690 return -EINVAL; 691 692 lock_sock(sk); 693 if (sk->sk_state != IUCV_OPEN) { 694 err = -EBADFD; 695 goto done; 696 } 697 698 write_lock_bh(&iucv_sk_list.lock); 699 700 iucv = iucv_sk(sk); 701 if (__iucv_get_sock_by_name(sa->siucv_name)) { 702 err = -EADDRINUSE; 703 goto done_unlock; 704 } 705 if (iucv->path) 706 goto done_unlock; 707 708 /* Bind the socket */ 709 710 if (pr_iucv) 711 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 712 goto vm_bind; /* VM IUCV transport */ 713 714 /* try hiper transport */ 715 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 716 ASCEBC(uid, 8); 717 rcu_read_lock(); 718 for_each_netdev_rcu(&init_net, dev) { 719 if (!memcmp(dev->perm_addr, uid, 8)) { 720 memcpy(iucv->src_name, sa->siucv_name, 8); 721 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 722 sk->sk_bound_dev_if = dev->ifindex; 723 sk->sk_state = IUCV_BOUND; 724 iucv->transport = AF_IUCV_TRANS_HIPER; 725 if (!iucv->msglimit) 726 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 727 rcu_read_unlock(); 728 goto done_unlock; 729 } 730 } 731 rcu_read_unlock(); 732vm_bind: 733 if (pr_iucv) { 734 /* use local userid for backward compat */ 735 memcpy(iucv->src_name, sa->siucv_name, 8); 736 memcpy(iucv->src_user_id, iucv_userid, 8); 737 sk->sk_state = IUCV_BOUND; 738 iucv->transport = AF_IUCV_TRANS_IUCV; 739 if (!iucv->msglimit) 740 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 741 goto done_unlock; 742 } 743 /* found no dev to bind */ 744 err = -ENODEV; 745done_unlock: 746 /* Release the socket list lock */ 747 write_unlock_bh(&iucv_sk_list.lock); 748done: 749 release_sock(sk); 750 return err; 751} 752 753/* Automatically bind an unbound socket */ 754static int iucv_sock_autobind(struct sock *sk) 755{ 756 struct iucv_sock *iucv = iucv_sk(sk); 757 char name[12]; 758 int err = 0; 759 760 if (unlikely(!pr_iucv)) 761 return -EPROTO; 762 763 memcpy(iucv->src_user_id, iucv_userid, 8); 764 765 write_lock_bh(&iucv_sk_list.lock); 766 767 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 768 while (__iucv_get_sock_by_name(name)) { 769 sprintf(name, "%08x", 770 atomic_inc_return(&iucv_sk_list.autobind_name)); 771 } 772 773 write_unlock_bh(&iucv_sk_list.lock); 774 775 memcpy(&iucv->src_name, name, 8); 776 777 if (!iucv->msglimit) 778 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 779 780 return err; 781} 782 783static int afiucv_hs_connect(struct socket *sock) 784{ 785 struct sock *sk = sock->sk; 786 struct sk_buff *skb; 787 int blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 788 int err = 0; 789 790 /* send syn */ 791 skb = sock_alloc_send_skb(sk, blen, 1, &err); 792 if (!skb) { 793 err = -ENOMEM; 794 goto done; 795 } 796 skb->dev = NULL; 797 skb_reserve(skb, blen); 798 err = afiucv_hs_send(NULL, sk, skb, AF_IUCV_FLAG_SYN); 799done: 800 return err; 801} 802 803static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 804{ 805 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 806 struct sock *sk = sock->sk; 807 struct iucv_sock *iucv = iucv_sk(sk); 808 unsigned char user_data[16]; 809 int err; 810 811 high_nmcpy(user_data, sa->siucv_name); 812 low_nmcpy(user_data, iucv->src_name); 813 ASCEBC(user_data, sizeof(user_data)); 814 815 /* Create path. */ 816 iucv->path = iucv_path_alloc(iucv->msglimit, 817 IUCV_IPRMDATA, GFP_KERNEL); 818 if (!iucv->path) { 819 err = -ENOMEM; 820 goto done; 821 } 822 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 823 sa->siucv_user_id, NULL, user_data, 824 sk); 825 if (err) { 826 iucv_path_free(iucv->path); 827 iucv->path = NULL; 828 switch (err) { 829 case 0x0b: /* Target communicator is not logged on */ 830 err = -ENETUNREACH; 831 break; 832 case 0x0d: /* Max connections for this guest exceeded */ 833 case 0x0e: /* Max connections for target guest exceeded */ 834 err = -EAGAIN; 835 break; 836 case 0x0f: /* Missing IUCV authorization */ 837 err = -EACCES; 838 break; 839 default: 840 err = -ECONNREFUSED; 841 break; 842 } 843 } 844done: 845 return err; 846} 847 848/* Connect an unconnected socket */ 849static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 850 int alen, int flags) 851{ 852 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 853 struct sock *sk = sock->sk; 854 struct iucv_sock *iucv = iucv_sk(sk); 855 int err; 856 857 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) 858 return -EINVAL; 859 860 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 861 return -EBADFD; 862 863 if (sk->sk_state == IUCV_OPEN && 864 iucv->transport == AF_IUCV_TRANS_HIPER) 865 return -EBADFD; /* explicit bind required */ 866 867 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 868 return -EINVAL; 869 870 if (sk->sk_state == IUCV_OPEN) { 871 err = iucv_sock_autobind(sk); 872 if (unlikely(err)) 873 return err; 874 } 875 876 lock_sock(sk); 877 878 /* Set the destination information */ 879 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 880 memcpy(iucv->dst_name, sa->siucv_name, 8); 881 882 if (iucv->transport == AF_IUCV_TRANS_HIPER) 883 err = afiucv_hs_connect(sock); 884 else 885 err = afiucv_path_connect(sock, addr); 886 if (err) 887 goto done; 888 889 if (sk->sk_state != IUCV_CONNECTED) 890 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 891 IUCV_DISCONN), 892 sock_sndtimeo(sk, flags & O_NONBLOCK)); 893 894 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 895 err = -ECONNREFUSED; 896 897 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) { 898 pr_iucv->path_sever(iucv->path, NULL); 899 iucv_path_free(iucv->path); 900 iucv->path = NULL; 901 } 902 903done: 904 release_sock(sk); 905 return err; 906} 907 908/* Move a socket into listening state. */ 909static int iucv_sock_listen(struct socket *sock, int backlog) 910{ 911 struct sock *sk = sock->sk; 912 int err; 913 914 lock_sock(sk); 915 916 err = -EINVAL; 917 if (sk->sk_state != IUCV_BOUND) 918 goto done; 919 920 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 921 goto done; 922 923 sk->sk_max_ack_backlog = backlog; 924 sk->sk_ack_backlog = 0; 925 sk->sk_state = IUCV_LISTEN; 926 err = 0; 927 928done: 929 release_sock(sk); 930 return err; 931} 932 933/* Accept a pending connection */ 934static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 935 int flags) 936{ 937 DECLARE_WAITQUEUE(wait, current); 938 struct sock *sk = sock->sk, *nsk; 939 long timeo; 940 int err = 0; 941 942 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 943 944 if (sk->sk_state != IUCV_LISTEN) { 945 err = -EBADFD; 946 goto done; 947 } 948 949 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 950 951 /* Wait for an incoming connection */ 952 add_wait_queue_exclusive(sk_sleep(sk), &wait); 953 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 954 set_current_state(TASK_INTERRUPTIBLE); 955 if (!timeo) { 956 err = -EAGAIN; 957 break; 958 } 959 960 release_sock(sk); 961 timeo = schedule_timeout(timeo); 962 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 963 964 if (sk->sk_state != IUCV_LISTEN) { 965 err = -EBADFD; 966 break; 967 } 968 969 if (signal_pending(current)) { 970 err = sock_intr_errno(timeo); 971 break; 972 } 973 } 974 975 set_current_state(TASK_RUNNING); 976 remove_wait_queue(sk_sleep(sk), &wait); 977 978 if (err) 979 goto done; 980 981 newsock->state = SS_CONNECTED; 982 983done: 984 release_sock(sk); 985 return err; 986} 987 988static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 989 int *len, int peer) 990{ 991 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 992 struct sock *sk = sock->sk; 993 struct iucv_sock *iucv = iucv_sk(sk); 994 995 addr->sa_family = AF_IUCV; 996 *len = sizeof(struct sockaddr_iucv); 997 998 if (peer) { 999 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 1000 memcpy(siucv->siucv_name, iucv->dst_name, 8); 1001 } else { 1002 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 1003 memcpy(siucv->siucv_name, iucv->src_name, 8); 1004 } 1005 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 1006 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 1007 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 1008 1009 return 0; 1010} 1011 1012/** 1013 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 1014 * @path: IUCV path 1015 * @msg: Pointer to a struct iucv_message 1016 * @skb: The socket data to send, skb->len MUST BE <= 7 1017 * 1018 * Send the socket data in the parameter list in the iucv message 1019 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 1020 * list and the socket data len at index 7 (last byte). 1021 * See also iucv_msg_length(). 1022 * 1023 * Returns the error code from the iucv_message_send() call. 1024 */ 1025static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 1026 struct sk_buff *skb) 1027{ 1028 u8 prmdata[8]; 1029 1030 memcpy(prmdata, (void *) skb->data, skb->len); 1031 prmdata[7] = 0xff - (u8) skb->len; 1032 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 1033 (void *) prmdata, 8); 1034} 1035 1036static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, 1037 struct msghdr *msg, size_t len) 1038{ 1039 struct sock *sk = sock->sk; 1040 struct iucv_sock *iucv = iucv_sk(sk); 1041 struct sk_buff *skb; 1042 struct iucv_message txmsg; 1043 struct cmsghdr *cmsg; 1044 int cmsg_done; 1045 long timeo; 1046 char user_id[9]; 1047 char appl_id[9]; 1048 int err; 1049 int noblock = msg->msg_flags & MSG_DONTWAIT; 1050 1051 err = sock_error(sk); 1052 if (err) 1053 return err; 1054 1055 if (msg->msg_flags & MSG_OOB) 1056 return -EOPNOTSUPP; 1057 1058 /* SOCK_SEQPACKET: we do not support segmented records */ 1059 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 1060 return -EOPNOTSUPP; 1061 1062 lock_sock(sk); 1063 1064 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1065 err = -EPIPE; 1066 goto out; 1067 } 1068 1069 /* Return if the socket is not in connected state */ 1070 if (sk->sk_state != IUCV_CONNECTED) { 1071 err = -ENOTCONN; 1072 goto out; 1073 } 1074 1075 /* initialize defaults */ 1076 cmsg_done = 0; /* check for duplicate headers */ 1077 txmsg.class = 0; 1078 1079 /* iterate over control messages */ 1080 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; 1081 cmsg = CMSG_NXTHDR(msg, cmsg)) { 1082 1083 if (!CMSG_OK(msg, cmsg)) { 1084 err = -EINVAL; 1085 goto out; 1086 } 1087 1088 if (cmsg->cmsg_level != SOL_IUCV) 1089 continue; 1090 1091 if (cmsg->cmsg_type & cmsg_done) { 1092 err = -EINVAL; 1093 goto out; 1094 } 1095 cmsg_done |= cmsg->cmsg_type; 1096 1097 switch (cmsg->cmsg_type) { 1098 case SCM_IUCV_TRGCLS: 1099 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 1100 err = -EINVAL; 1101 goto out; 1102 } 1103 1104 /* set iucv message target class */ 1105 memcpy(&txmsg.class, 1106 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 1107 1108 break; 1109 1110 default: 1111 err = -EINVAL; 1112 goto out; 1113 break; 1114 } 1115 } 1116 1117 /* allocate one skb for each iucv message: 1118 * this is fine for SOCK_SEQPACKET (unless we want to support 1119 * segmented records using the MSG_EOR flag), but 1120 * for SOCK_STREAM we might want to improve it in future */ 1121 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1122 skb = sock_alloc_send_skb(sk, 1123 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, 1124 noblock, &err); 1125 else 1126 skb = sock_alloc_send_skb(sk, len, noblock, &err); 1127 if (!skb) 1128 goto out; 1129 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1130 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); 1131 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { 1132 err = -EFAULT; 1133 goto fail; 1134 } 1135 1136 /* wait if outstanding messages for iucv path has reached */ 1137 timeo = sock_sndtimeo(sk, noblock); 1138 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1139 if (err) 1140 goto fail; 1141 1142 /* return -ECONNRESET if the socket is no longer connected */ 1143 if (sk->sk_state != IUCV_CONNECTED) { 1144 err = -ECONNRESET; 1145 goto fail; 1146 } 1147 1148 /* increment and save iucv message tag for msg_completion cbk */ 1149 txmsg.tag = iucv->send_tag++; 1150 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); 1151 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1152 atomic_inc(&iucv->msg_sent); 1153 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1154 if (err) { 1155 atomic_dec(&iucv->msg_sent); 1156 goto fail; 1157 } 1158 goto release; 1159 } 1160 skb_queue_tail(&iucv->send_skb_q, skb); 1161 1162 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) 1163 && skb->len <= 7) { 1164 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1165 1166 /* on success: there is no message_complete callback 1167 * for an IPRMDATA msg; remove skb from send queue */ 1168 if (err == 0) { 1169 skb_unlink(skb, &iucv->send_skb_q); 1170 kfree_skb(skb); 1171 } 1172 1173 /* this error should never happen since the 1174 * IUCV_IPRMDATA path flag is set... sever path */ 1175 if (err == 0x15) { 1176 pr_iucv->path_sever(iucv->path, NULL); 1177 skb_unlink(skb, &iucv->send_skb_q); 1178 err = -EPIPE; 1179 goto fail; 1180 } 1181 } else 1182 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, 1183 (void *) skb->data, skb->len); 1184 if (err) { 1185 if (err == 3) { 1186 user_id[8] = 0; 1187 memcpy(user_id, iucv->dst_user_id, 8); 1188 appl_id[8] = 0; 1189 memcpy(appl_id, iucv->dst_name, 8); 1190 pr_err("Application %s on z/VM guest %s" 1191 " exceeds message limit\n", 1192 appl_id, user_id); 1193 err = -EAGAIN; 1194 } else 1195 err = -EPIPE; 1196 skb_unlink(skb, &iucv->send_skb_q); 1197 goto fail; 1198 } 1199 1200release: 1201 release_sock(sk); 1202 return len; 1203 1204fail: 1205 if (skb->dev) 1206 dev_put(skb->dev); 1207 kfree_skb(skb); 1208out: 1209 release_sock(sk); 1210 return err; 1211} 1212 1213/* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's 1214 * 1215 * Locking: must be called with message_q.lock held 1216 */ 1217static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) 1218{ 1219 int dataleft, size, copied = 0; 1220 struct sk_buff *nskb; 1221 1222 dataleft = len; 1223 while (dataleft) { 1224 if (dataleft >= sk->sk_rcvbuf / 4) 1225 size = sk->sk_rcvbuf / 4; 1226 else 1227 size = dataleft; 1228 1229 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); 1230 if (!nskb) 1231 return -ENOMEM; 1232 1233 /* copy target class to control buffer of new skb */ 1234 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); 1235 1236 /* copy data fragment */ 1237 memcpy(nskb->data, skb->data + copied, size); 1238 copied += size; 1239 dataleft -= size; 1240 1241 skb_reset_transport_header(nskb); 1242 skb_reset_network_header(nskb); 1243 nskb->len = size; 1244 1245 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); 1246 } 1247 1248 return 0; 1249} 1250 1251/* iucv_process_message() - Receive a single outstanding IUCV message 1252 * 1253 * Locking: must be called with message_q.lock held 1254 */ 1255static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1256 struct iucv_path *path, 1257 struct iucv_message *msg) 1258{ 1259 int rc; 1260 unsigned int len; 1261 1262 len = iucv_msg_length(msg); 1263 1264 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1265 /* Note: the first 4 bytes are reserved for msg tag */ 1266 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); 1267 1268 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1269 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1270 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1271 skb->data = NULL; 1272 skb->len = 0; 1273 } 1274 } else { 1275 rc = pr_iucv->message_receive(path, msg, 1276 msg->flags & IUCV_IPRMDATA, 1277 skb->data, len, NULL); 1278 if (rc) { 1279 kfree_skb(skb); 1280 return; 1281 } 1282 /* we need to fragment iucv messages for SOCK_STREAM only; 1283 * for SOCK_SEQPACKET, it is only relevant if we support 1284 * record segmentation using MSG_EOR (see also recvmsg()) */ 1285 if (sk->sk_type == SOCK_STREAM && 1286 skb->truesize >= sk->sk_rcvbuf / 4) { 1287 rc = iucv_fragment_skb(sk, skb, len); 1288 kfree_skb(skb); 1289 skb = NULL; 1290 if (rc) { 1291 pr_iucv->path_sever(path, NULL); 1292 return; 1293 } 1294 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); 1295 } else { 1296 skb_reset_transport_header(skb); 1297 skb_reset_network_header(skb); 1298 skb->len = len; 1299 } 1300 } 1301 1302 if (sock_queue_rcv_skb(sk, skb)) 1303 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); 1304} 1305 1306/* iucv_process_message_q() - Process outstanding IUCV messages 1307 * 1308 * Locking: must be called with message_q.lock held 1309 */ 1310static void iucv_process_message_q(struct sock *sk) 1311{ 1312 struct iucv_sock *iucv = iucv_sk(sk); 1313 struct sk_buff *skb; 1314 struct sock_msg_q *p, *n; 1315 1316 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1317 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); 1318 if (!skb) 1319 break; 1320 iucv_process_message(sk, skb, p->path, &p->msg); 1321 list_del(&p->list); 1322 kfree(p); 1323 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1324 break; 1325 } 1326} 1327 1328static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, 1329 struct msghdr *msg, size_t len, int flags) 1330{ 1331 int noblock = flags & MSG_DONTWAIT; 1332 struct sock *sk = sock->sk; 1333 struct iucv_sock *iucv = iucv_sk(sk); 1334 unsigned int copied, rlen; 1335 struct sk_buff *skb, *rskb, *cskb, *sskb; 1336 int blen; 1337 int err = 0; 1338 1339 if ((sk->sk_state == IUCV_DISCONN) && 1340 skb_queue_empty(&iucv->backlog_skb_q) && 1341 skb_queue_empty(&sk->sk_receive_queue) && 1342 list_empty(&iucv->message_q.list)) 1343 return 0; 1344 1345 if (flags & (MSG_OOB)) 1346 return -EOPNOTSUPP; 1347 1348 /* receive/dequeue next skb: 1349 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1350 skb = skb_recv_datagram(sk, flags, noblock, &err); 1351 if (!skb) { 1352 if (sk->sk_shutdown & RCV_SHUTDOWN) 1353 return 0; 1354 return err; 1355 } 1356 1357 rlen = skb->len; /* real length of skb */ 1358 copied = min_t(unsigned int, rlen, len); 1359 1360 cskb = skb; 1361 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) { 1362 if (!(flags & MSG_PEEK)) 1363 skb_queue_head(&sk->sk_receive_queue, skb); 1364 return -EFAULT; 1365 } 1366 1367 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1368 if (sk->sk_type == SOCK_SEQPACKET) { 1369 if (copied < rlen) 1370 msg->msg_flags |= MSG_TRUNC; 1371 /* each iucv message contains a complete record */ 1372 msg->msg_flags |= MSG_EOR; 1373 } 1374 1375 /* create control message to store iucv msg target class: 1376 * get the trgcls from the control buffer of the skb due to 1377 * fragmentation of original iucv message. */ 1378 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1379 CB_TRGCLS_LEN, CB_TRGCLS(skb)); 1380 if (err) { 1381 if (!(flags & MSG_PEEK)) 1382 skb_queue_head(&sk->sk_receive_queue, skb); 1383 return err; 1384 } 1385 1386 /* Mark read part of skb as used */ 1387 if (!(flags & MSG_PEEK)) { 1388 1389 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1390 if (sk->sk_type == SOCK_STREAM) { 1391 skb_pull(skb, copied); 1392 if (skb->len) { 1393 skb_queue_head(&sk->sk_receive_queue, skb); 1394 goto done; 1395 } 1396 } 1397 1398 kfree_skb(skb); 1399 atomic_inc(&iucv->msg_recv); 1400 1401 /* Queue backlog skbs */ 1402 spin_lock_bh(&iucv->message_q.lock); 1403 rskb = skb_dequeue(&iucv->backlog_skb_q); 1404 while (rskb) { 1405 if (sock_queue_rcv_skb(sk, rskb)) { 1406 skb_queue_head(&iucv->backlog_skb_q, 1407 rskb); 1408 break; 1409 } else { 1410 rskb = skb_dequeue(&iucv->backlog_skb_q); 1411 } 1412 } 1413 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1414 if (!list_empty(&iucv->message_q.list)) 1415 iucv_process_message_q(sk); 1416 if (atomic_read(&iucv->msg_recv) >= 1417 iucv->msglimit / 2) { 1418 /* send WIN to peer */ 1419 blen = sizeof(struct af_iucv_trans_hdr) + 1420 ETH_HLEN; 1421 sskb = sock_alloc_send_skb(sk, blen, 1, &err); 1422 if (sskb) { 1423 skb_reserve(sskb, blen); 1424 err = afiucv_hs_send(NULL, sk, sskb, 1425 AF_IUCV_FLAG_WIN); 1426 } 1427 if (err) { 1428 sk->sk_state = IUCV_DISCONN; 1429 sk->sk_state_change(sk); 1430 } 1431 } 1432 } 1433 spin_unlock_bh(&iucv->message_q.lock); 1434 } 1435 1436done: 1437 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1438 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1439 copied = rlen; 1440 1441 return copied; 1442} 1443 1444static inline unsigned int iucv_accept_poll(struct sock *parent) 1445{ 1446 struct iucv_sock *isk, *n; 1447 struct sock *sk; 1448 1449 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1450 sk = (struct sock *) isk; 1451 1452 if (sk->sk_state == IUCV_CONNECTED) 1453 return POLLIN | POLLRDNORM; 1454 } 1455 1456 return 0; 1457} 1458 1459unsigned int iucv_sock_poll(struct file *file, struct socket *sock, 1460 poll_table *wait) 1461{ 1462 struct sock *sk = sock->sk; 1463 unsigned int mask = 0; 1464 1465 sock_poll_wait(file, sk_sleep(sk), wait); 1466 1467 if (sk->sk_state == IUCV_LISTEN) 1468 return iucv_accept_poll(sk); 1469 1470 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1471 mask |= POLLERR; 1472 1473 if (sk->sk_shutdown & RCV_SHUTDOWN) 1474 mask |= POLLRDHUP; 1475 1476 if (sk->sk_shutdown == SHUTDOWN_MASK) 1477 mask |= POLLHUP; 1478 1479 if (!skb_queue_empty(&sk->sk_receive_queue) || 1480 (sk->sk_shutdown & RCV_SHUTDOWN)) 1481 mask |= POLLIN | POLLRDNORM; 1482 1483 if (sk->sk_state == IUCV_CLOSED) 1484 mask |= POLLHUP; 1485 1486 if (sk->sk_state == IUCV_DISCONN) 1487 mask |= POLLIN; 1488 1489 if (sock_writeable(sk)) 1490 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 1491 else 1492 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1493 1494 return mask; 1495} 1496 1497static int iucv_sock_shutdown(struct socket *sock, int how) 1498{ 1499 struct sock *sk = sock->sk; 1500 struct iucv_sock *iucv = iucv_sk(sk); 1501 struct iucv_message txmsg; 1502 int err = 0; 1503 1504 how++; 1505 1506 if ((how & ~SHUTDOWN_MASK) || !how) 1507 return -EINVAL; 1508 1509 lock_sock(sk); 1510 switch (sk->sk_state) { 1511 case IUCV_DISCONN: 1512 case IUCV_CLOSING: 1513 case IUCV_CLOSED: 1514 err = -ENOTCONN; 1515 goto fail; 1516 1517 default: 1518 sk->sk_shutdown |= how; 1519 break; 1520 } 1521 1522 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1523 txmsg.class = 0; 1524 txmsg.tag = 0; 1525 err = pr_iucv->message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 1526 0, (void *) iprm_shutdown, 8); 1527 if (err) { 1528 switch (err) { 1529 case 1: 1530 err = -ENOTCONN; 1531 break; 1532 case 2: 1533 err = -ECONNRESET; 1534 break; 1535 default: 1536 err = -ENOTCONN; 1537 break; 1538 } 1539 } 1540 } 1541 1542 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1543 err = pr_iucv->path_quiesce(iucv->path, NULL); 1544 if (err) 1545 err = -ENOTCONN; 1546 1547 skb_queue_purge(&sk->sk_receive_queue); 1548 } 1549 1550 /* Wake up anyone sleeping in poll */ 1551 sk->sk_state_change(sk); 1552 1553fail: 1554 release_sock(sk); 1555 return err; 1556} 1557 1558static int iucv_sock_release(struct socket *sock) 1559{ 1560 struct sock *sk = sock->sk; 1561 int err = 0; 1562 1563 if (!sk) 1564 return 0; 1565 1566 iucv_sock_close(sk); 1567 1568 /* Unregister with IUCV base support */ 1569 if (iucv_sk(sk)->path) { 1570 pr_iucv->path_sever(iucv_sk(sk)->path, NULL); 1571 iucv_path_free(iucv_sk(sk)->path); 1572 iucv_sk(sk)->path = NULL; 1573 } 1574 1575 sock_orphan(sk); 1576 iucv_sock_kill(sk); 1577 return err; 1578} 1579 1580/* getsockopt and setsockopt */ 1581static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1582 char __user *optval, unsigned int optlen) 1583{ 1584 struct sock *sk = sock->sk; 1585 struct iucv_sock *iucv = iucv_sk(sk); 1586 int val; 1587 int rc; 1588 1589 if (level != SOL_IUCV) 1590 return -ENOPROTOOPT; 1591 1592 if (optlen < sizeof(int)) 1593 return -EINVAL; 1594 1595 if (get_user(val, (int __user *) optval)) 1596 return -EFAULT; 1597 1598 rc = 0; 1599 1600 lock_sock(sk); 1601 switch (optname) { 1602 case SO_IPRMDATA_MSG: 1603 if (val) 1604 iucv->flags |= IUCV_IPRMDATA; 1605 else 1606 iucv->flags &= ~IUCV_IPRMDATA; 1607 break; 1608 case SO_MSGLIMIT: 1609 switch (sk->sk_state) { 1610 case IUCV_OPEN: 1611 case IUCV_BOUND: 1612 if (val < 1 || val > (u16)(~0)) 1613 rc = -EINVAL; 1614 else 1615 iucv->msglimit = val; 1616 break; 1617 default: 1618 rc = -EINVAL; 1619 break; 1620 } 1621 break; 1622 default: 1623 rc = -ENOPROTOOPT; 1624 break; 1625 } 1626 release_sock(sk); 1627 1628 return rc; 1629} 1630 1631static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1632 char __user *optval, int __user *optlen) 1633{ 1634 struct sock *sk = sock->sk; 1635 struct iucv_sock *iucv = iucv_sk(sk); 1636 int val, len; 1637 1638 if (level != SOL_IUCV) 1639 return -ENOPROTOOPT; 1640 1641 if (get_user(len, optlen)) 1642 return -EFAULT; 1643 1644 if (len < 0) 1645 return -EINVAL; 1646 1647 len = min_t(unsigned int, len, sizeof(int)); 1648 1649 switch (optname) { 1650 case SO_IPRMDATA_MSG: 1651 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1652 break; 1653 case SO_MSGLIMIT: 1654 lock_sock(sk); 1655 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1656 : iucv->msglimit; /* default */ 1657 release_sock(sk); 1658 break; 1659 default: 1660 return -ENOPROTOOPT; 1661 } 1662 1663 if (put_user(len, optlen)) 1664 return -EFAULT; 1665 if (copy_to_user(optval, &val, len)) 1666 return -EFAULT; 1667 1668 return 0; 1669} 1670 1671 1672/* Callback wrappers - called from iucv base support */ 1673static int iucv_callback_connreq(struct iucv_path *path, 1674 u8 ipvmid[8], u8 ipuser[16]) 1675{ 1676 unsigned char user_data[16]; 1677 unsigned char nuser_data[16]; 1678 unsigned char src_name[8]; 1679 struct hlist_node *node; 1680 struct sock *sk, *nsk; 1681 struct iucv_sock *iucv, *niucv; 1682 int err; 1683 1684 memcpy(src_name, ipuser, 8); 1685 EBCASC(src_name, 8); 1686 /* Find out if this path belongs to af_iucv. */ 1687 read_lock(&iucv_sk_list.lock); 1688 iucv = NULL; 1689 sk = NULL; 1690 sk_for_each(sk, node, &iucv_sk_list.head) 1691 if (sk->sk_state == IUCV_LISTEN && 1692 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1693 /* 1694 * Found a listening socket with 1695 * src_name == ipuser[0-7]. 1696 */ 1697 iucv = iucv_sk(sk); 1698 break; 1699 } 1700 read_unlock(&iucv_sk_list.lock); 1701 if (!iucv) 1702 /* No socket found, not one of our paths. */ 1703 return -EINVAL; 1704 1705 bh_lock_sock(sk); 1706 1707 /* Check if parent socket is listening */ 1708 low_nmcpy(user_data, iucv->src_name); 1709 high_nmcpy(user_data, iucv->dst_name); 1710 ASCEBC(user_data, sizeof(user_data)); 1711 if (sk->sk_state != IUCV_LISTEN) { 1712 err = pr_iucv->path_sever(path, user_data); 1713 iucv_path_free(path); 1714 goto fail; 1715 } 1716 1717 /* Check for backlog size */ 1718 if (sk_acceptq_is_full(sk)) { 1719 err = pr_iucv->path_sever(path, user_data); 1720 iucv_path_free(path); 1721 goto fail; 1722 } 1723 1724 /* Create the new socket */ 1725 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); 1726 if (!nsk) { 1727 err = pr_iucv->path_sever(path, user_data); 1728 iucv_path_free(path); 1729 goto fail; 1730 } 1731 1732 niucv = iucv_sk(nsk); 1733 iucv_sock_init(nsk, sk); 1734 1735 /* Set the new iucv_sock */ 1736 memcpy(niucv->dst_name, ipuser + 8, 8); 1737 EBCASC(niucv->dst_name, 8); 1738 memcpy(niucv->dst_user_id, ipvmid, 8); 1739 memcpy(niucv->src_name, iucv->src_name, 8); 1740 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1741 niucv->path = path; 1742 1743 /* Call iucv_accept */ 1744 high_nmcpy(nuser_data, ipuser + 8); 1745 memcpy(nuser_data + 8, niucv->src_name, 8); 1746 ASCEBC(nuser_data + 8, 8); 1747 1748 /* set message limit for path based on msglimit of accepting socket */ 1749 niucv->msglimit = iucv->msglimit; 1750 path->msglim = iucv->msglimit; 1751 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1752 if (err) { 1753 err = pr_iucv->path_sever(path, user_data); 1754 iucv_path_free(path); 1755 iucv_sock_kill(nsk); 1756 goto fail; 1757 } 1758 1759 iucv_accept_enqueue(sk, nsk); 1760 1761 /* Wake up accept */ 1762 nsk->sk_state = IUCV_CONNECTED; 1763 sk->sk_data_ready(sk, 1); 1764 err = 0; 1765fail: 1766 bh_unlock_sock(sk); 1767 return 0; 1768} 1769 1770static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1771{ 1772 struct sock *sk = path->private; 1773 1774 sk->sk_state = IUCV_CONNECTED; 1775 sk->sk_state_change(sk); 1776} 1777 1778static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1779{ 1780 struct sock *sk = path->private; 1781 struct iucv_sock *iucv = iucv_sk(sk); 1782 struct sk_buff *skb; 1783 struct sock_msg_q *save_msg; 1784 int len; 1785 1786 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1787 pr_iucv->message_reject(path, msg); 1788 return; 1789 } 1790 1791 spin_lock(&iucv->message_q.lock); 1792 1793 if (!list_empty(&iucv->message_q.list) || 1794 !skb_queue_empty(&iucv->backlog_skb_q)) 1795 goto save_message; 1796 1797 len = atomic_read(&sk->sk_rmem_alloc); 1798 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1799 if (len > sk->sk_rcvbuf) 1800 goto save_message; 1801 1802 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); 1803 if (!skb) 1804 goto save_message; 1805 1806 iucv_process_message(sk, skb, path, msg); 1807 goto out_unlock; 1808 1809save_message: 1810 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1811 if (!save_msg) 1812 goto out_unlock; 1813 save_msg->path = path; 1814 save_msg->msg = *msg; 1815 1816 list_add_tail(&save_msg->list, &iucv->message_q.list); 1817 1818out_unlock: 1819 spin_unlock(&iucv->message_q.lock); 1820} 1821 1822static void iucv_callback_txdone(struct iucv_path *path, 1823 struct iucv_message *msg) 1824{ 1825 struct sock *sk = path->private; 1826 struct sk_buff *this = NULL; 1827 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1828 struct sk_buff *list_skb = list->next; 1829 unsigned long flags; 1830 1831 if (!skb_queue_empty(list)) { 1832 spin_lock_irqsave(&list->lock, flags); 1833 1834 while (list_skb != (struct sk_buff *)list) { 1835 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { 1836 this = list_skb; 1837 break; 1838 } 1839 list_skb = list_skb->next; 1840 } 1841 if (this) 1842 __skb_unlink(this, list); 1843 1844 spin_unlock_irqrestore(&list->lock, flags); 1845 1846 if (this) { 1847 kfree_skb(this); 1848 /* wake up any process waiting for sending */ 1849 iucv_sock_wake_msglim(sk); 1850 } 1851 } 1852 BUG_ON(!this); 1853 1854 if (sk->sk_state == IUCV_CLOSING) { 1855 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1856 sk->sk_state = IUCV_CLOSED; 1857 sk->sk_state_change(sk); 1858 } 1859 } 1860 1861} 1862 1863static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1864{ 1865 struct sock *sk = path->private; 1866 1867 sk->sk_state = IUCV_DISCONN; 1868 1869 sk->sk_state_change(sk); 1870} 1871 1872/* called if the other communication side shuts down its RECV direction; 1873 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1874 */ 1875static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1876{ 1877 struct sock *sk = path->private; 1878 1879 bh_lock_sock(sk); 1880 if (sk->sk_state != IUCV_CLOSED) { 1881 sk->sk_shutdown |= SEND_SHUTDOWN; 1882 sk->sk_state_change(sk); 1883 } 1884 bh_unlock_sock(sk); 1885} 1886 1887/***************** HiperSockets transport callbacks ********************/ 1888static void afiucv_swap_src_dest(struct sk_buff *skb) 1889{ 1890 struct af_iucv_trans_hdr *trans_hdr = 1891 (struct af_iucv_trans_hdr *)skb->data; 1892 char tmpID[8]; 1893 char tmpName[8]; 1894 1895 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1896 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1897 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1898 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1899 memcpy(tmpID, trans_hdr->srcUserID, 8); 1900 memcpy(tmpName, trans_hdr->srcAppName, 8); 1901 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1902 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1903 memcpy(trans_hdr->destUserID, tmpID, 8); 1904 memcpy(trans_hdr->destAppName, tmpName, 8); 1905 skb_push(skb, ETH_HLEN); 1906 memset(skb->data, 0, ETH_HLEN); 1907} 1908 1909/** 1910 * afiucv_hs_callback_syn - react on received SYN 1911 **/ 1912static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1913{ 1914 struct sock *nsk; 1915 struct iucv_sock *iucv, *niucv; 1916 struct af_iucv_trans_hdr *trans_hdr; 1917 int err; 1918 1919 iucv = iucv_sk(sk); 1920 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 1921 if (!iucv) { 1922 /* no sock - connection refused */ 1923 afiucv_swap_src_dest(skb); 1924 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1925 err = dev_queue_xmit(skb); 1926 goto out; 1927 } 1928 1929 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); 1930 bh_lock_sock(sk); 1931 if ((sk->sk_state != IUCV_LISTEN) || 1932 sk_acceptq_is_full(sk) || 1933 !nsk) { 1934 /* error on server socket - connection refused */ 1935 if (nsk) 1936 sk_free(nsk); 1937 afiucv_swap_src_dest(skb); 1938 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1939 err = dev_queue_xmit(skb); 1940 bh_unlock_sock(sk); 1941 goto out; 1942 } 1943 1944 niucv = iucv_sk(nsk); 1945 iucv_sock_init(nsk, sk); 1946 niucv->transport = AF_IUCV_TRANS_HIPER; 1947 niucv->msglimit = iucv->msglimit; 1948 if (!trans_hdr->window) 1949 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1950 else 1951 niucv->msglimit_peer = trans_hdr->window; 1952 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1953 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1954 memcpy(niucv->src_name, iucv->src_name, 8); 1955 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1956 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1957 afiucv_swap_src_dest(skb); 1958 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1959 trans_hdr->window = niucv->msglimit; 1960 /* if receiver acks the xmit connection is established */ 1961 err = dev_queue_xmit(skb); 1962 if (!err) { 1963 iucv_accept_enqueue(sk, nsk); 1964 nsk->sk_state = IUCV_CONNECTED; 1965 sk->sk_data_ready(sk, 1); 1966 } else 1967 iucv_sock_kill(nsk); 1968 bh_unlock_sock(sk); 1969 1970out: 1971 return NET_RX_SUCCESS; 1972} 1973 1974/** 1975 * afiucv_hs_callback_synack() - react on received SYN-ACK 1976 **/ 1977static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1978{ 1979 struct iucv_sock *iucv = iucv_sk(sk); 1980 struct af_iucv_trans_hdr *trans_hdr = 1981 (struct af_iucv_trans_hdr *)skb->data; 1982 1983 if (!iucv) 1984 goto out; 1985 if (sk->sk_state != IUCV_BOUND) 1986 goto out; 1987 bh_lock_sock(sk); 1988 iucv->msglimit_peer = trans_hdr->window; 1989 sk->sk_state = IUCV_CONNECTED; 1990 sk->sk_state_change(sk); 1991 bh_unlock_sock(sk); 1992out: 1993 kfree_skb(skb); 1994 return NET_RX_SUCCESS; 1995} 1996 1997/** 1998 * afiucv_hs_callback_synfin() - react on received SYN_FIN 1999 **/ 2000static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 2001{ 2002 struct iucv_sock *iucv = iucv_sk(sk); 2003 2004 if (!iucv) 2005 goto out; 2006 if (sk->sk_state != IUCV_BOUND) 2007 goto out; 2008 bh_lock_sock(sk); 2009 sk->sk_state = IUCV_DISCONN; 2010 sk->sk_state_change(sk); 2011 bh_unlock_sock(sk); 2012out: 2013 kfree_skb(skb); 2014 return NET_RX_SUCCESS; 2015} 2016 2017/** 2018 * afiucv_hs_callback_fin() - react on received FIN 2019 **/ 2020static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 2021{ 2022 struct iucv_sock *iucv = iucv_sk(sk); 2023 2024 /* other end of connection closed */ 2025 if (iucv) { 2026 bh_lock_sock(sk); 2027 sk->sk_state = IUCV_DISCONN; 2028 sk->sk_state_change(sk); 2029 bh_unlock_sock(sk); 2030 } 2031 kfree_skb(skb); 2032 return NET_RX_SUCCESS; 2033} 2034 2035/** 2036 * afiucv_hs_callback_win() - react on received WIN 2037 **/ 2038static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2039{ 2040 struct iucv_sock *iucv = iucv_sk(sk); 2041 struct af_iucv_trans_hdr *trans_hdr = 2042 (struct af_iucv_trans_hdr *)skb->data; 2043 2044 if (!iucv) 2045 return NET_RX_SUCCESS; 2046 2047 if (sk->sk_state != IUCV_CONNECTED) 2048 return NET_RX_SUCCESS; 2049 2050 atomic_sub(trans_hdr->window, &iucv->msg_sent); 2051 iucv_sock_wake_msglim(sk); 2052 return NET_RX_SUCCESS; 2053} 2054 2055/** 2056 * afiucv_hs_callback_rx() - react on received data 2057 **/ 2058static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2059{ 2060 struct iucv_sock *iucv = iucv_sk(sk); 2061 2062 if (!iucv) { 2063 kfree_skb(skb); 2064 return NET_RX_SUCCESS; 2065 } 2066 2067 if (sk->sk_state != IUCV_CONNECTED) { 2068 kfree_skb(skb); 2069 return NET_RX_SUCCESS; 2070 } 2071 2072 /* write stuff from iucv_msg to skb cb */ 2073 if (skb->len <= sizeof(struct af_iucv_trans_hdr)) { 2074 kfree_skb(skb); 2075 return NET_RX_SUCCESS; 2076 } 2077 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2078 skb_reset_transport_header(skb); 2079 skb_reset_network_header(skb); 2080 spin_lock(&iucv->message_q.lock); 2081 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2082 if (sock_queue_rcv_skb(sk, skb)) { 2083 /* handle rcv queue full */ 2084 skb_queue_tail(&iucv->backlog_skb_q, skb); 2085 } 2086 } else 2087 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2088 spin_unlock(&iucv->message_q.lock); 2089 return NET_RX_SUCCESS; 2090} 2091 2092/** 2093 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2094 * transport 2095 * called from netif RX softirq 2096 **/ 2097static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2098 struct packet_type *pt, struct net_device *orig_dev) 2099{ 2100 struct hlist_node *node; 2101 struct sock *sk; 2102 struct iucv_sock *iucv; 2103 struct af_iucv_trans_hdr *trans_hdr; 2104 char nullstring[8]; 2105 int err = 0; 2106 2107 skb_pull(skb, ETH_HLEN); 2108 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 2109 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2110 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2111 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2112 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2113 memset(nullstring, 0, sizeof(nullstring)); 2114 iucv = NULL; 2115 sk = NULL; 2116 read_lock(&iucv_sk_list.lock); 2117 sk_for_each(sk, node, &iucv_sk_list.head) { 2118 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2119 if ((!memcmp(&iucv_sk(sk)->src_name, 2120 trans_hdr->destAppName, 8)) && 2121 (!memcmp(&iucv_sk(sk)->src_user_id, 2122 trans_hdr->destUserID, 8)) && 2123 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2124 (!memcmp(&iucv_sk(sk)->dst_user_id, 2125 nullstring, 8))) { 2126 iucv = iucv_sk(sk); 2127 break; 2128 } 2129 } else { 2130 if ((!memcmp(&iucv_sk(sk)->src_name, 2131 trans_hdr->destAppName, 8)) && 2132 (!memcmp(&iucv_sk(sk)->src_user_id, 2133 trans_hdr->destUserID, 8)) && 2134 (!memcmp(&iucv_sk(sk)->dst_name, 2135 trans_hdr->srcAppName, 8)) && 2136 (!memcmp(&iucv_sk(sk)->dst_user_id, 2137 trans_hdr->srcUserID, 8))) { 2138 iucv = iucv_sk(sk); 2139 break; 2140 } 2141 } 2142 } 2143 read_unlock(&iucv_sk_list.lock); 2144 if (!iucv) 2145 sk = NULL; 2146 2147 /* no sock 2148 how should we send with no sock 2149 1) send without sock no send rc checking? 2150 2) introduce default sock to handle this cases 2151 2152 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2153 data -> send FIN 2154 SYN|ACK, SYN|FIN, FIN -> no action? */ 2155 2156 switch (trans_hdr->flags) { 2157 case AF_IUCV_FLAG_SYN: 2158 /* connect request */ 2159 err = afiucv_hs_callback_syn(sk, skb); 2160 break; 2161 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2162 /* connect request confirmed */ 2163 err = afiucv_hs_callback_synack(sk, skb); 2164 break; 2165 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2166 /* connect request refused */ 2167 err = afiucv_hs_callback_synfin(sk, skb); 2168 break; 2169 case (AF_IUCV_FLAG_FIN): 2170 /* close request */ 2171 err = afiucv_hs_callback_fin(sk, skb); 2172 break; 2173 case (AF_IUCV_FLAG_WIN): 2174 err = afiucv_hs_callback_win(sk, skb); 2175 if (skb->len > sizeof(struct af_iucv_trans_hdr)) 2176 err = afiucv_hs_callback_rx(sk, skb); 2177 else 2178 kfree(skb); 2179 break; 2180 case 0: 2181 /* plain data frame */ 2182 memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class, 2183 CB_TRGCLS_LEN); 2184 err = afiucv_hs_callback_rx(sk, skb); 2185 break; 2186 default: 2187 ; 2188 } 2189 2190 return err; 2191} 2192 2193/** 2194 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2195 * transport 2196 **/ 2197static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2198 enum iucv_tx_notify n) 2199{ 2200 struct sock *isk = skb->sk; 2201 struct sock *sk = NULL; 2202 struct iucv_sock *iucv = NULL; 2203 struct sk_buff_head *list; 2204 struct sk_buff *list_skb; 2205 struct sk_buff *this = NULL; 2206 unsigned long flags; 2207 struct hlist_node *node; 2208 2209 read_lock(&iucv_sk_list.lock); 2210 sk_for_each(sk, node, &iucv_sk_list.head) 2211 if (sk == isk) { 2212 iucv = iucv_sk(sk); 2213 break; 2214 } 2215 read_unlock(&iucv_sk_list.lock); 2216 2217 if (!iucv) 2218 return; 2219 2220 bh_lock_sock(sk); 2221 list = &iucv->send_skb_q; 2222 list_skb = list->next; 2223 if (skb_queue_empty(list)) 2224 goto out_unlock; 2225 2226 spin_lock_irqsave(&list->lock, flags); 2227 while (list_skb != (struct sk_buff *)list) { 2228 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2229 this = list_skb; 2230 switch (n) { 2231 case TX_NOTIFY_OK: 2232 __skb_unlink(this, list); 2233 iucv_sock_wake_msglim(sk); 2234 dev_put(this->dev); 2235 kfree_skb(this); 2236 break; 2237 case TX_NOTIFY_PENDING: 2238 atomic_inc(&iucv->pendings); 2239 break; 2240 case TX_NOTIFY_DELAYED_OK: 2241 __skb_unlink(this, list); 2242 atomic_dec(&iucv->pendings); 2243 if (atomic_read(&iucv->pendings) <= 0) 2244 iucv_sock_wake_msglim(sk); 2245 dev_put(this->dev); 2246 kfree_skb(this); 2247 break; 2248 case TX_NOTIFY_UNREACHABLE: 2249 case TX_NOTIFY_DELAYED_UNREACHABLE: 2250 case TX_NOTIFY_TPQFULL: /* not yet used */ 2251 case TX_NOTIFY_GENERALERROR: 2252 case TX_NOTIFY_DELAYED_GENERALERROR: 2253 __skb_unlink(this, list); 2254 dev_put(this->dev); 2255 kfree_skb(this); 2256 sk->sk_state = IUCV_DISCONN; 2257 sk->sk_state_change(sk); 2258 break; 2259 } 2260 break; 2261 } 2262 list_skb = list_skb->next; 2263 } 2264 spin_unlock_irqrestore(&list->lock, flags); 2265 2266 if (sk->sk_state == IUCV_CLOSING) { 2267 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2268 sk->sk_state = IUCV_CLOSED; 2269 sk->sk_state_change(sk); 2270 } 2271 } 2272 2273out_unlock: 2274 bh_unlock_sock(sk); 2275} 2276static const struct proto_ops iucv_sock_ops = { 2277 .family = PF_IUCV, 2278 .owner = THIS_MODULE, 2279 .release = iucv_sock_release, 2280 .bind = iucv_sock_bind, 2281 .connect = iucv_sock_connect, 2282 .listen = iucv_sock_listen, 2283 .accept = iucv_sock_accept, 2284 .getname = iucv_sock_getname, 2285 .sendmsg = iucv_sock_sendmsg, 2286 .recvmsg = iucv_sock_recvmsg, 2287 .poll = iucv_sock_poll, 2288 .ioctl = sock_no_ioctl, 2289 .mmap = sock_no_mmap, 2290 .socketpair = sock_no_socketpair, 2291 .shutdown = iucv_sock_shutdown, 2292 .setsockopt = iucv_sock_setsockopt, 2293 .getsockopt = iucv_sock_getsockopt, 2294}; 2295 2296static const struct net_proto_family iucv_sock_family_ops = { 2297 .family = AF_IUCV, 2298 .owner = THIS_MODULE, 2299 .create = iucv_sock_create, 2300}; 2301 2302static struct packet_type iucv_packet_type = { 2303 .type = cpu_to_be16(ETH_P_AF_IUCV), 2304 .func = afiucv_hs_rcv, 2305}; 2306 2307static int afiucv_iucv_init(void) 2308{ 2309 int err; 2310 2311 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2312 if (err) 2313 goto out; 2314 /* establish dummy device */ 2315 af_iucv_driver.bus = pr_iucv->bus; 2316 err = driver_register(&af_iucv_driver); 2317 if (err) 2318 goto out_iucv; 2319 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 2320 if (!af_iucv_dev) { 2321 err = -ENOMEM; 2322 goto out_driver; 2323 } 2324 dev_set_name(af_iucv_dev, "af_iucv"); 2325 af_iucv_dev->bus = pr_iucv->bus; 2326 af_iucv_dev->parent = pr_iucv->root; 2327 af_iucv_dev->release = (void (*)(struct device *))kfree; 2328 af_iucv_dev->driver = &af_iucv_driver; 2329 err = device_register(af_iucv_dev); 2330 if (err) 2331 goto out_driver; 2332 return 0; 2333 2334out_driver: 2335 driver_unregister(&af_iucv_driver); 2336out_iucv: 2337 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2338out: 2339 return err; 2340} 2341 2342static int __init afiucv_init(void) 2343{ 2344 int err; 2345 2346 if (MACHINE_IS_VM) { 2347 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2348 if (unlikely(err)) { 2349 WARN_ON(err); 2350 err = -EPROTONOSUPPORT; 2351 goto out; 2352 } 2353 2354 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2355 if (!pr_iucv) { 2356 printk(KERN_WARNING "iucv_if lookup failed\n"); 2357 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2358 } 2359 } else { 2360 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2361 pr_iucv = NULL; 2362 } 2363 2364 err = proto_register(&iucv_proto, 0); 2365 if (err) 2366 goto out; 2367 err = sock_register(&iucv_sock_family_ops); 2368 if (err) 2369 goto out_proto; 2370 2371 if (pr_iucv) { 2372 err = afiucv_iucv_init(); 2373 if (err) 2374 goto out_sock; 2375 } 2376 dev_add_pack(&iucv_packet_type); 2377 return 0; 2378 2379out_sock: 2380 sock_unregister(PF_IUCV); 2381out_proto: 2382 proto_unregister(&iucv_proto); 2383out: 2384 if (pr_iucv) 2385 symbol_put(iucv_if); 2386 return err; 2387} 2388 2389static void __exit afiucv_exit(void) 2390{ 2391 if (pr_iucv) { 2392 device_unregister(af_iucv_dev); 2393 driver_unregister(&af_iucv_driver); 2394 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2395 symbol_put(iucv_if); 2396 } 2397 dev_remove_pack(&iucv_packet_type); 2398 sock_unregister(PF_IUCV); 2399 proto_unregister(&iucv_proto); 2400} 2401 2402module_init(afiucv_init); 2403module_exit(afiucv_exit); 2404 2405MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2406MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2407MODULE_VERSION(VERSION); 2408MODULE_LICENSE("GPL"); 2409MODULE_ALIAS_NETPROTO(PF_IUCV); 2410 2411