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#define __iucv_sock_wait(sk, condition, timeo, ret) \ 53do { \ 54 DEFINE_WAIT(__wait); \ 55 long __timeo = timeo; \ 56 ret = 0; \ 57 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 58 while (!(condition)) { \ 59 if (!__timeo) { \ 60 ret = -EAGAIN; \ 61 break; \ 62 } \ 63 if (signal_pending(current)) { \ 64 ret = sock_intr_errno(__timeo); \ 65 break; \ 66 } \ 67 release_sock(sk); \ 68 __timeo = schedule_timeout(__timeo); \ 69 lock_sock(sk); \ 70 ret = sock_error(sk); \ 71 if (ret) \ 72 break; \ 73 } \ 74 finish_wait(sk_sleep(sk), &__wait); \ 75} while (0) 76 77#define iucv_sock_wait(sk, condition, timeo) \ 78({ \ 79 int __ret = 0; \ 80 if (!(condition)) \ 81 __iucv_sock_wait(sk, condition, timeo, __ret); \ 82 __ret; \ 83}) 84 85static void iucv_sock_kill(struct sock *sk); 86static void iucv_sock_close(struct sock *sk); 87static void iucv_sever_path(struct sock *, int); 88 89static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 90 struct packet_type *pt, struct net_device *orig_dev); 91static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 92 struct sk_buff *skb, u8 flags); 93static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); 94 95/* Call Back functions */ 96static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 97static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 98static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); 99static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], 100 u8 ipuser[16]); 101static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); 102static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); 103 104static struct iucv_sock_list iucv_sk_list = { 105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 106 .autobind_name = ATOMIC_INIT(0) 107}; 108 109static struct iucv_handler af_iucv_handler = { 110 .path_pending = iucv_callback_connreq, 111 .path_complete = iucv_callback_connack, 112 .path_severed = iucv_callback_connrej, 113 .message_pending = iucv_callback_rx, 114 .message_complete = iucv_callback_txdone, 115 .path_quiesced = iucv_callback_shutdown, 116}; 117 118static inline void high_nmcpy(unsigned char *dst, char *src) 119{ 120 memcpy(dst, src, 8); 121} 122 123static inline void low_nmcpy(unsigned char *dst, char *src) 124{ 125 memcpy(&dst[8], src, 8); 126} 127 128static int afiucv_pm_prepare(struct device *dev) 129{ 130#ifdef CONFIG_PM_DEBUG 131 printk(KERN_WARNING "afiucv_pm_prepare\n"); 132#endif 133 return 0; 134} 135 136static void afiucv_pm_complete(struct device *dev) 137{ 138#ifdef CONFIG_PM_DEBUG 139 printk(KERN_WARNING "afiucv_pm_complete\n"); 140#endif 141} 142 143/** 144 * afiucv_pm_freeze() - Freeze PM callback 145 * @dev: AFIUCV dummy device 146 * 147 * Sever all established IUCV communication pathes 148 */ 149static int afiucv_pm_freeze(struct device *dev) 150{ 151 struct iucv_sock *iucv; 152 struct sock *sk; 153 int err = 0; 154 155#ifdef CONFIG_PM_DEBUG 156 printk(KERN_WARNING "afiucv_pm_freeze\n"); 157#endif 158 read_lock(&iucv_sk_list.lock); 159 sk_for_each(sk, &iucv_sk_list.head) { 160 iucv = iucv_sk(sk); 161 switch (sk->sk_state) { 162 case IUCV_DISCONN: 163 case IUCV_CLOSING: 164 case IUCV_CONNECTED: 165 iucv_sever_path(sk, 0); 166 break; 167 case IUCV_OPEN: 168 case IUCV_BOUND: 169 case IUCV_LISTEN: 170 case IUCV_CLOSED: 171 default: 172 break; 173 } 174 skb_queue_purge(&iucv->send_skb_q); 175 skb_queue_purge(&iucv->backlog_skb_q); 176 } 177 read_unlock(&iucv_sk_list.lock); 178 return err; 179} 180 181/** 182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback 183 * @dev: AFIUCV dummy device 184 * 185 * socket clean up after freeze 186 */ 187static int afiucv_pm_restore_thaw(struct device *dev) 188{ 189 struct sock *sk; 190 191#ifdef CONFIG_PM_DEBUG 192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); 193#endif 194 read_lock(&iucv_sk_list.lock); 195 sk_for_each(sk, &iucv_sk_list.head) { 196 switch (sk->sk_state) { 197 case IUCV_CONNECTED: 198 sk->sk_err = EPIPE; 199 sk->sk_state = IUCV_DISCONN; 200 sk->sk_state_change(sk); 201 break; 202 case IUCV_DISCONN: 203 case IUCV_CLOSING: 204 case IUCV_LISTEN: 205 case IUCV_BOUND: 206 case IUCV_OPEN: 207 default: 208 break; 209 } 210 } 211 read_unlock(&iucv_sk_list.lock); 212 return 0; 213} 214 215static const struct dev_pm_ops afiucv_pm_ops = { 216 .prepare = afiucv_pm_prepare, 217 .complete = afiucv_pm_complete, 218 .freeze = afiucv_pm_freeze, 219 .thaw = afiucv_pm_restore_thaw, 220 .restore = afiucv_pm_restore_thaw, 221}; 222 223static struct device_driver af_iucv_driver = { 224 .owner = THIS_MODULE, 225 .name = "afiucv", 226 .bus = NULL, 227 .pm = &afiucv_pm_ops, 228}; 229 230/* dummy device used as trigger for PM functions */ 231static struct device *af_iucv_dev; 232 233/** 234 * iucv_msg_length() - Returns the length of an iucv message. 235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 236 * 237 * The function returns the length of the specified iucv message @msg of data 238 * stored in a buffer and of data stored in the parameter list (PRMDATA). 239 * 240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 241 * data: 242 * PRMDATA[0..6] socket data (max 7 bytes); 243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 244 * 245 * The socket data length is computed by subtracting the socket data length 246 * value from 0xFF. 247 * If the socket data len is greater 7, then PRMDATA can be used for special 248 * notifications (see iucv_sock_shutdown); and further, 249 * if the socket data len is > 7, the function returns 8. 250 * 251 * Use this function to allocate socket buffers to store iucv message data. 252 */ 253static inline size_t iucv_msg_length(struct iucv_message *msg) 254{ 255 size_t datalen; 256 257 if (msg->flags & IUCV_IPRMDATA) { 258 datalen = 0xff - msg->rmmsg[7]; 259 return (datalen < 8) ? datalen : 8; 260 } 261 return msg->length; 262} 263 264/** 265 * iucv_sock_in_state() - check for specific states 266 * @sk: sock structure 267 * @state: first iucv sk state 268 * @state: second iucv sk state 269 * 270 * Returns true if the socket in either in the first or second state. 271 */ 272static int iucv_sock_in_state(struct sock *sk, int state, int state2) 273{ 274 return (sk->sk_state == state || sk->sk_state == state2); 275} 276 277/** 278 * iucv_below_msglim() - function to check if messages can be sent 279 * @sk: sock structure 280 * 281 * Returns true if the send queue length is lower than the message limit. 282 * Always returns true if the socket is not connected (no iucv path for 283 * checking the message limit). 284 */ 285static inline int iucv_below_msglim(struct sock *sk) 286{ 287 struct iucv_sock *iucv = iucv_sk(sk); 288 289 if (sk->sk_state != IUCV_CONNECTED) 290 return 1; 291 if (iucv->transport == AF_IUCV_TRANS_IUCV) 292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); 293 else 294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 295 (atomic_read(&iucv->pendings) <= 0)); 296} 297 298/** 299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 300 */ 301static void iucv_sock_wake_msglim(struct sock *sk) 302{ 303 struct socket_wq *wq; 304 305 rcu_read_lock(); 306 wq = rcu_dereference(sk->sk_wq); 307 if (wq_has_sleeper(wq)) 308 wake_up_interruptible_all(&wq->wait); 309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 310 rcu_read_unlock(); 311} 312 313/** 314 * afiucv_hs_send() - send a message through HiperSockets transport 315 */ 316static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 317 struct sk_buff *skb, u8 flags) 318{ 319 struct iucv_sock *iucv = iucv_sk(sock); 320 struct af_iucv_trans_hdr *phs_hdr; 321 struct sk_buff *nskb; 322 int err, confirm_recv = 0; 323 324 memset(skb->head, 0, ETH_HLEN); 325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, 326 sizeof(struct af_iucv_trans_hdr)); 327 skb_reset_mac_header(skb); 328 skb_reset_network_header(skb); 329 skb_push(skb, ETH_HLEN); 330 skb_reset_mac_header(skb); 331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); 332 333 phs_hdr->magic = ETH_P_AF_IUCV; 334 phs_hdr->version = 1; 335 phs_hdr->flags = flags; 336 if (flags == AF_IUCV_FLAG_SYN) 337 phs_hdr->window = iucv->msglimit; 338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 339 confirm_recv = atomic_read(&iucv->msg_recv); 340 phs_hdr->window = confirm_recv; 341 if (confirm_recv) 342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 343 } 344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 352 if (imsg) 353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 354 355 skb->dev = iucv->hs_dev; 356 if (!skb->dev) 357 return -ENODEV; 358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) 359 return -ENETDOWN; 360 if (skb->len > skb->dev->mtu) { 361 if (sock->sk_type == SOCK_SEQPACKET) 362 return -EMSGSIZE; 363 else 364 skb_trim(skb, skb->dev->mtu); 365 } 366 skb->protocol = ETH_P_AF_IUCV; 367 nskb = skb_clone(skb, GFP_ATOMIC); 368 if (!nskb) 369 return -ENOMEM; 370 skb_queue_tail(&iucv->send_skb_q, nskb); 371 err = dev_queue_xmit(skb); 372 if (net_xmit_eval(err)) { 373 skb_unlink(nskb, &iucv->send_skb_q); 374 kfree_skb(nskb); 375 } else { 376 atomic_sub(confirm_recv, &iucv->msg_recv); 377 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 378 } 379 return net_xmit_eval(err); 380} 381 382static struct sock *__iucv_get_sock_by_name(char *nm) 383{ 384 struct sock *sk; 385 386 sk_for_each(sk, &iucv_sk_list.head) 387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 388 return sk; 389 390 return NULL; 391} 392 393static void iucv_sock_destruct(struct sock *sk) 394{ 395 skb_queue_purge(&sk->sk_receive_queue); 396 skb_queue_purge(&sk->sk_error_queue); 397 398 sk_mem_reclaim(sk); 399 400 if (!sock_flag(sk, SOCK_DEAD)) { 401 pr_err("Attempt to release alive iucv socket %p\n", sk); 402 return; 403 } 404 405 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 406 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 407 WARN_ON(sk->sk_wmem_queued); 408 WARN_ON(sk->sk_forward_alloc); 409} 410 411/* Cleanup Listen */ 412static void iucv_sock_cleanup_listen(struct sock *parent) 413{ 414 struct sock *sk; 415 416 /* Close non-accepted connections */ 417 while ((sk = iucv_accept_dequeue(parent, NULL))) { 418 iucv_sock_close(sk); 419 iucv_sock_kill(sk); 420 } 421 422 parent->sk_state = IUCV_CLOSED; 423} 424 425/* Kill socket (only if zapped and orphaned) */ 426static void iucv_sock_kill(struct sock *sk) 427{ 428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 429 return; 430 431 iucv_sock_unlink(&iucv_sk_list, sk); 432 sock_set_flag(sk, SOCK_DEAD); 433 sock_put(sk); 434} 435 436/* Terminate an IUCV path */ 437static void iucv_sever_path(struct sock *sk, int with_user_data) 438{ 439 unsigned char user_data[16]; 440 struct iucv_sock *iucv = iucv_sk(sk); 441 struct iucv_path *path = iucv->path; 442 443 if (iucv->path) { 444 iucv->path = NULL; 445 if (with_user_data) { 446 low_nmcpy(user_data, iucv->src_name); 447 high_nmcpy(user_data, iucv->dst_name); 448 ASCEBC(user_data, sizeof(user_data)); 449 pr_iucv->path_sever(path, user_data); 450 } else 451 pr_iucv->path_sever(path, NULL); 452 iucv_path_free(path); 453 } 454} 455 456/* Send FIN through an IUCV socket for HIPER transport */ 457static int iucv_send_ctrl(struct sock *sk, u8 flags) 458{ 459 int err = 0; 460 int blen; 461 struct sk_buff *skb; 462 463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 464 skb = sock_alloc_send_skb(sk, blen, 1, &err); 465 if (skb) { 466 skb_reserve(skb, blen); 467 err = afiucv_hs_send(NULL, sk, skb, flags); 468 } 469 return err; 470} 471 472/* Close an IUCV socket */ 473static void iucv_sock_close(struct sock *sk) 474{ 475 struct iucv_sock *iucv = iucv_sk(sk); 476 unsigned long timeo; 477 int err = 0; 478 479 lock_sock(sk); 480 481 switch (sk->sk_state) { 482 case IUCV_LISTEN: 483 iucv_sock_cleanup_listen(sk); 484 break; 485 486 case IUCV_CONNECTED: 487 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 488 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 489 sk->sk_state = IUCV_DISCONN; 490 sk->sk_state_change(sk); 491 } 492 case IUCV_DISCONN: /* fall through */ 493 sk->sk_state = IUCV_CLOSING; 494 sk->sk_state_change(sk); 495 496 if (!err && !skb_queue_empty(&iucv->send_skb_q)) { 497 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 498 timeo = sk->sk_lingertime; 499 else 500 timeo = IUCV_DISCONN_TIMEOUT; 501 iucv_sock_wait(sk, 502 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 503 timeo); 504 } 505 506 case IUCV_CLOSING: /* fall through */ 507 sk->sk_state = IUCV_CLOSED; 508 sk->sk_state_change(sk); 509 510 sk->sk_err = ECONNRESET; 511 sk->sk_state_change(sk); 512 513 skb_queue_purge(&iucv->send_skb_q); 514 skb_queue_purge(&iucv->backlog_skb_q); 515 516 default: /* fall through */ 517 iucv_sever_path(sk, 1); 518 } 519 520 if (iucv->hs_dev) { 521 dev_put(iucv->hs_dev); 522 iucv->hs_dev = NULL; 523 sk->sk_bound_dev_if = 0; 524 } 525 526 /* mark socket for deletion by iucv_sock_kill() */ 527 sock_set_flag(sk, SOCK_ZAPPED); 528 529 release_sock(sk); 530} 531 532static void iucv_sock_init(struct sock *sk, struct sock *parent) 533{ 534 if (parent) 535 sk->sk_type = parent->sk_type; 536} 537 538static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) 539{ 540 struct sock *sk; 541 struct iucv_sock *iucv; 542 543 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); 544 if (!sk) 545 return NULL; 546 iucv = iucv_sk(sk); 547 548 sock_init_data(sock, sk); 549 INIT_LIST_HEAD(&iucv->accept_q); 550 spin_lock_init(&iucv->accept_q_lock); 551 skb_queue_head_init(&iucv->send_skb_q); 552 INIT_LIST_HEAD(&iucv->message_q.list); 553 spin_lock_init(&iucv->message_q.lock); 554 skb_queue_head_init(&iucv->backlog_skb_q); 555 iucv->send_tag = 0; 556 atomic_set(&iucv->pendings, 0); 557 iucv->flags = 0; 558 iucv->msglimit = 0; 559 atomic_set(&iucv->msg_sent, 0); 560 atomic_set(&iucv->msg_recv, 0); 561 iucv->path = NULL; 562 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 563 memset(&iucv->src_user_id , 0, 32); 564 if (pr_iucv) 565 iucv->transport = AF_IUCV_TRANS_IUCV; 566 else 567 iucv->transport = AF_IUCV_TRANS_HIPER; 568 569 sk->sk_destruct = iucv_sock_destruct; 570 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 571 sk->sk_allocation = GFP_DMA; 572 573 sock_reset_flag(sk, SOCK_ZAPPED); 574 575 sk->sk_protocol = proto; 576 sk->sk_state = IUCV_OPEN; 577 578 iucv_sock_link(&iucv_sk_list, sk); 579 return sk; 580} 581 582/* Create an IUCV socket */ 583static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 584 int kern) 585{ 586 struct sock *sk; 587 588 if (protocol && protocol != PF_IUCV) 589 return -EPROTONOSUPPORT; 590 591 sock->state = SS_UNCONNECTED; 592 593 switch (sock->type) { 594 case SOCK_STREAM: 595 sock->ops = &iucv_sock_ops; 596 break; 597 case SOCK_SEQPACKET: 598 /* currently, proto ops can handle both sk types */ 599 sock->ops = &iucv_sock_ops; 600 break; 601 default: 602 return -ESOCKTNOSUPPORT; 603 } 604 605 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); 606 if (!sk) 607 return -ENOMEM; 608 609 iucv_sock_init(sk, NULL); 610 611 return 0; 612} 613 614void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 615{ 616 write_lock_bh(&l->lock); 617 sk_add_node(sk, &l->head); 618 write_unlock_bh(&l->lock); 619} 620 621void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 622{ 623 write_lock_bh(&l->lock); 624 sk_del_node_init(sk); 625 write_unlock_bh(&l->lock); 626} 627 628void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 629{ 630 unsigned long flags; 631 struct iucv_sock *par = iucv_sk(parent); 632 633 sock_hold(sk); 634 spin_lock_irqsave(&par->accept_q_lock, flags); 635 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 636 spin_unlock_irqrestore(&par->accept_q_lock, flags); 637 iucv_sk(sk)->parent = parent; 638 sk_acceptq_added(parent); 639} 640 641void iucv_accept_unlink(struct sock *sk) 642{ 643 unsigned long flags; 644 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 645 646 spin_lock_irqsave(&par->accept_q_lock, flags); 647 list_del_init(&iucv_sk(sk)->accept_q); 648 spin_unlock_irqrestore(&par->accept_q_lock, flags); 649 sk_acceptq_removed(iucv_sk(sk)->parent); 650 iucv_sk(sk)->parent = NULL; 651 sock_put(sk); 652} 653 654struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 655{ 656 struct iucv_sock *isk, *n; 657 struct sock *sk; 658 659 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 660 sk = (struct sock *) isk; 661 lock_sock(sk); 662 663 if (sk->sk_state == IUCV_CLOSED) { 664 iucv_accept_unlink(sk); 665 release_sock(sk); 666 continue; 667 } 668 669 if (sk->sk_state == IUCV_CONNECTED || 670 sk->sk_state == IUCV_DISCONN || 671 !newsock) { 672 iucv_accept_unlink(sk); 673 if (newsock) 674 sock_graft(sk, newsock); 675 676 release_sock(sk); 677 return sk; 678 } 679 680 release_sock(sk); 681 } 682 return NULL; 683} 684 685static void __iucv_auto_name(struct iucv_sock *iucv) 686{ 687 char name[12]; 688 689 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 690 while (__iucv_get_sock_by_name(name)) { 691 sprintf(name, "%08x", 692 atomic_inc_return(&iucv_sk_list.autobind_name)); 693 } 694 memcpy(iucv->src_name, name, 8); 695} 696 697/* Bind an unbound socket */ 698static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 699 int addr_len) 700{ 701 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 702 struct sock *sk = sock->sk; 703 struct iucv_sock *iucv; 704 int err = 0; 705 struct net_device *dev; 706 char uid[9]; 707 708 /* Verify the input sockaddr */ 709 if (!addr || addr->sa_family != AF_IUCV) 710 return -EINVAL; 711 712 if (addr_len < sizeof(struct sockaddr_iucv)) 713 return -EINVAL; 714 715 lock_sock(sk); 716 if (sk->sk_state != IUCV_OPEN) { 717 err = -EBADFD; 718 goto done; 719 } 720 721 write_lock_bh(&iucv_sk_list.lock); 722 723 iucv = iucv_sk(sk); 724 if (__iucv_get_sock_by_name(sa->siucv_name)) { 725 err = -EADDRINUSE; 726 goto done_unlock; 727 } 728 if (iucv->path) 729 goto done_unlock; 730 731 /* Bind the socket */ 732 if (pr_iucv) 733 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 734 goto vm_bind; /* VM IUCV transport */ 735 736 /* try hiper transport */ 737 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 738 ASCEBC(uid, 8); 739 rcu_read_lock(); 740 for_each_netdev_rcu(&init_net, dev) { 741 if (!memcmp(dev->perm_addr, uid, 8)) { 742 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 743 /* Check for unitialized siucv_name */ 744 if (strncmp(sa->siucv_name, " ", 8) == 0) 745 __iucv_auto_name(iucv); 746 else 747 memcpy(iucv->src_name, sa->siucv_name, 8); 748 sk->sk_bound_dev_if = dev->ifindex; 749 iucv->hs_dev = dev; 750 dev_hold(dev); 751 sk->sk_state = IUCV_BOUND; 752 iucv->transport = AF_IUCV_TRANS_HIPER; 753 if (!iucv->msglimit) 754 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 755 rcu_read_unlock(); 756 goto done_unlock; 757 } 758 } 759 rcu_read_unlock(); 760vm_bind: 761 if (pr_iucv) { 762 /* use local userid for backward compat */ 763 memcpy(iucv->src_name, sa->siucv_name, 8); 764 memcpy(iucv->src_user_id, iucv_userid, 8); 765 sk->sk_state = IUCV_BOUND; 766 iucv->transport = AF_IUCV_TRANS_IUCV; 767 if (!iucv->msglimit) 768 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 769 goto done_unlock; 770 } 771 /* found no dev to bind */ 772 err = -ENODEV; 773done_unlock: 774 /* Release the socket list lock */ 775 write_unlock_bh(&iucv_sk_list.lock); 776done: 777 release_sock(sk); 778 return err; 779} 780 781/* Automatically bind an unbound socket */ 782static int iucv_sock_autobind(struct sock *sk) 783{ 784 struct iucv_sock *iucv = iucv_sk(sk); 785 int err = 0; 786 787 if (unlikely(!pr_iucv)) 788 return -EPROTO; 789 790 memcpy(iucv->src_user_id, iucv_userid, 8); 791 792 write_lock_bh(&iucv_sk_list.lock); 793 __iucv_auto_name(iucv); 794 write_unlock_bh(&iucv_sk_list.lock); 795 796 if (!iucv->msglimit) 797 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 798 799 return err; 800} 801 802static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 803{ 804 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 805 struct sock *sk = sock->sk; 806 struct iucv_sock *iucv = iucv_sk(sk); 807 unsigned char user_data[16]; 808 int err; 809 810 high_nmcpy(user_data, sa->siucv_name); 811 low_nmcpy(user_data, iucv->src_name); 812 ASCEBC(user_data, sizeof(user_data)); 813 814 /* Create path. */ 815 iucv->path = iucv_path_alloc(iucv->msglimit, 816 IUCV_IPRMDATA, GFP_KERNEL); 817 if (!iucv->path) { 818 err = -ENOMEM; 819 goto done; 820 } 821 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 822 sa->siucv_user_id, NULL, user_data, 823 sk); 824 if (err) { 825 iucv_path_free(iucv->path); 826 iucv->path = NULL; 827 switch (err) { 828 case 0x0b: /* Target communicator is not logged on */ 829 err = -ENETUNREACH; 830 break; 831 case 0x0d: /* Max connections for this guest exceeded */ 832 case 0x0e: /* Max connections for target guest exceeded */ 833 err = -EAGAIN; 834 break; 835 case 0x0f: /* Missing IUCV authorization */ 836 err = -EACCES; 837 break; 838 default: 839 err = -ECONNREFUSED; 840 break; 841 } 842 } 843done: 844 return err; 845} 846 847/* Connect an unconnected socket */ 848static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 849 int alen, int flags) 850{ 851 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 852 struct sock *sk = sock->sk; 853 struct iucv_sock *iucv = iucv_sk(sk); 854 int err; 855 856 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) 857 return -EINVAL; 858 859 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 860 return -EBADFD; 861 862 if (sk->sk_state == IUCV_OPEN && 863 iucv->transport == AF_IUCV_TRANS_HIPER) 864 return -EBADFD; /* explicit bind required */ 865 866 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 867 return -EINVAL; 868 869 if (sk->sk_state == IUCV_OPEN) { 870 err = iucv_sock_autobind(sk); 871 if (unlikely(err)) 872 return err; 873 } 874 875 lock_sock(sk); 876 877 /* Set the destination information */ 878 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 879 memcpy(iucv->dst_name, sa->siucv_name, 8); 880 881 if (iucv->transport == AF_IUCV_TRANS_HIPER) 882 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 883 else 884 err = afiucv_path_connect(sock, addr); 885 if (err) 886 goto done; 887 888 if (sk->sk_state != IUCV_CONNECTED) 889 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 890 IUCV_DISCONN), 891 sock_sndtimeo(sk, flags & O_NONBLOCK)); 892 893 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 894 err = -ECONNREFUSED; 895 896 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 897 iucv_sever_path(sk, 0); 898 899done: 900 release_sock(sk); 901 return err; 902} 903 904/* Move a socket into listening state. */ 905static int iucv_sock_listen(struct socket *sock, int backlog) 906{ 907 struct sock *sk = sock->sk; 908 int err; 909 910 lock_sock(sk); 911 912 err = -EINVAL; 913 if (sk->sk_state != IUCV_BOUND) 914 goto done; 915 916 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 917 goto done; 918 919 sk->sk_max_ack_backlog = backlog; 920 sk->sk_ack_backlog = 0; 921 sk->sk_state = IUCV_LISTEN; 922 err = 0; 923 924done: 925 release_sock(sk); 926 return err; 927} 928 929/* Accept a pending connection */ 930static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 931 int flags) 932{ 933 DECLARE_WAITQUEUE(wait, current); 934 struct sock *sk = sock->sk, *nsk; 935 long timeo; 936 int err = 0; 937 938 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 939 940 if (sk->sk_state != IUCV_LISTEN) { 941 err = -EBADFD; 942 goto done; 943 } 944 945 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 946 947 /* Wait for an incoming connection */ 948 add_wait_queue_exclusive(sk_sleep(sk), &wait); 949 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 950 set_current_state(TASK_INTERRUPTIBLE); 951 if (!timeo) { 952 err = -EAGAIN; 953 break; 954 } 955 956 release_sock(sk); 957 timeo = schedule_timeout(timeo); 958 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 959 960 if (sk->sk_state != IUCV_LISTEN) { 961 err = -EBADFD; 962 break; 963 } 964 965 if (signal_pending(current)) { 966 err = sock_intr_errno(timeo); 967 break; 968 } 969 } 970 971 set_current_state(TASK_RUNNING); 972 remove_wait_queue(sk_sleep(sk), &wait); 973 974 if (err) 975 goto done; 976 977 newsock->state = SS_CONNECTED; 978 979done: 980 release_sock(sk); 981 return err; 982} 983 984static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 985 int *len, int peer) 986{ 987 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 988 struct sock *sk = sock->sk; 989 struct iucv_sock *iucv = iucv_sk(sk); 990 991 addr->sa_family = AF_IUCV; 992 *len = sizeof(struct sockaddr_iucv); 993 994 if (peer) { 995 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 996 memcpy(siucv->siucv_name, iucv->dst_name, 8); 997 } else { 998 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 999 memcpy(siucv->siucv_name, iucv->src_name, 8); 1000 } 1001 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 1002 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 1003 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 1004 1005 return 0; 1006} 1007 1008/** 1009 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 1010 * @path: IUCV path 1011 * @msg: Pointer to a struct iucv_message 1012 * @skb: The socket data to send, skb->len MUST BE <= 7 1013 * 1014 * Send the socket data in the parameter list in the iucv message 1015 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 1016 * list and the socket data len at index 7 (last byte). 1017 * See also iucv_msg_length(). 1018 * 1019 * Returns the error code from the iucv_message_send() call. 1020 */ 1021static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 1022 struct sk_buff *skb) 1023{ 1024 u8 prmdata[8]; 1025 1026 memcpy(prmdata, (void *) skb->data, skb->len); 1027 prmdata[7] = 0xff - (u8) skb->len; 1028 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 1029 (void *) prmdata, 8); 1030} 1031 1032static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 1033 size_t len) 1034{ 1035 struct sock *sk = sock->sk; 1036 struct iucv_sock *iucv = iucv_sk(sk); 1037 struct sk_buff *skb; 1038 struct iucv_message txmsg; 1039 struct cmsghdr *cmsg; 1040 int cmsg_done; 1041 long timeo; 1042 char user_id[9]; 1043 char appl_id[9]; 1044 int err; 1045 int noblock = msg->msg_flags & MSG_DONTWAIT; 1046 1047 err = sock_error(sk); 1048 if (err) 1049 return err; 1050 1051 if (msg->msg_flags & MSG_OOB) 1052 return -EOPNOTSUPP; 1053 1054 /* SOCK_SEQPACKET: we do not support segmented records */ 1055 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 1056 return -EOPNOTSUPP; 1057 1058 lock_sock(sk); 1059 1060 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1061 err = -EPIPE; 1062 goto out; 1063 } 1064 1065 /* Return if the socket is not in connected state */ 1066 if (sk->sk_state != IUCV_CONNECTED) { 1067 err = -ENOTCONN; 1068 goto out; 1069 } 1070 1071 /* initialize defaults */ 1072 cmsg_done = 0; /* check for duplicate headers */ 1073 txmsg.class = 0; 1074 1075 /* iterate over control messages */ 1076 for_each_cmsghdr(cmsg, msg) { 1077 if (!CMSG_OK(msg, cmsg)) { 1078 err = -EINVAL; 1079 goto out; 1080 } 1081 1082 if (cmsg->cmsg_level != SOL_IUCV) 1083 continue; 1084 1085 if (cmsg->cmsg_type & cmsg_done) { 1086 err = -EINVAL; 1087 goto out; 1088 } 1089 cmsg_done |= cmsg->cmsg_type; 1090 1091 switch (cmsg->cmsg_type) { 1092 case SCM_IUCV_TRGCLS: 1093 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 1094 err = -EINVAL; 1095 goto out; 1096 } 1097 1098 /* set iucv message target class */ 1099 memcpy(&txmsg.class, 1100 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 1101 1102 break; 1103 1104 default: 1105 err = -EINVAL; 1106 goto out; 1107 } 1108 } 1109 1110 /* allocate one skb for each iucv message: 1111 * this is fine for SOCK_SEQPACKET (unless we want to support 1112 * segmented records using the MSG_EOR flag), but 1113 * for SOCK_STREAM we might want to improve it in future */ 1114 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1115 skb = sock_alloc_send_skb(sk, 1116 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, 1117 noblock, &err); 1118 else 1119 skb = sock_alloc_send_skb(sk, len, noblock, &err); 1120 if (!skb) 1121 goto out; 1122 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1123 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); 1124 if (memcpy_from_msg(skb_put(skb, len), msg, len)) { 1125 err = -EFAULT; 1126 goto fail; 1127 } 1128 1129 /* wait if outstanding messages for iucv path has reached */ 1130 timeo = sock_sndtimeo(sk, noblock); 1131 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1132 if (err) 1133 goto fail; 1134 1135 /* return -ECONNRESET if the socket is no longer connected */ 1136 if (sk->sk_state != IUCV_CONNECTED) { 1137 err = -ECONNRESET; 1138 goto fail; 1139 } 1140 1141 /* increment and save iucv message tag for msg_completion cbk */ 1142 txmsg.tag = iucv->send_tag++; 1143 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1144 1145 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1146 atomic_inc(&iucv->msg_sent); 1147 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1148 if (err) { 1149 atomic_dec(&iucv->msg_sent); 1150 goto fail; 1151 } 1152 goto release; 1153 } 1154 skb_queue_tail(&iucv->send_skb_q, skb); 1155 1156 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) 1157 && skb->len <= 7) { 1158 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1159 1160 /* on success: there is no message_complete callback 1161 * for an IPRMDATA msg; remove skb from send queue */ 1162 if (err == 0) { 1163 skb_unlink(skb, &iucv->send_skb_q); 1164 kfree_skb(skb); 1165 } 1166 1167 /* this error should never happen since the 1168 * IUCV_IPRMDATA path flag is set... sever path */ 1169 if (err == 0x15) { 1170 pr_iucv->path_sever(iucv->path, NULL); 1171 skb_unlink(skb, &iucv->send_skb_q); 1172 err = -EPIPE; 1173 goto fail; 1174 } 1175 } else 1176 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, 1177 (void *) skb->data, skb->len); 1178 if (err) { 1179 if (err == 3) { 1180 user_id[8] = 0; 1181 memcpy(user_id, iucv->dst_user_id, 8); 1182 appl_id[8] = 0; 1183 memcpy(appl_id, iucv->dst_name, 8); 1184 pr_err("Application %s on z/VM guest %s" 1185 " exceeds message limit\n", 1186 appl_id, user_id); 1187 err = -EAGAIN; 1188 } else 1189 err = -EPIPE; 1190 skb_unlink(skb, &iucv->send_skb_q); 1191 goto fail; 1192 } 1193 1194release: 1195 release_sock(sk); 1196 return len; 1197 1198fail: 1199 kfree_skb(skb); 1200out: 1201 release_sock(sk); 1202 return err; 1203} 1204 1205/* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's 1206 * 1207 * Locking: must be called with message_q.lock held 1208 */ 1209static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) 1210{ 1211 int dataleft, size, copied = 0; 1212 struct sk_buff *nskb; 1213 1214 dataleft = len; 1215 while (dataleft) { 1216 if (dataleft >= sk->sk_rcvbuf / 4) 1217 size = sk->sk_rcvbuf / 4; 1218 else 1219 size = dataleft; 1220 1221 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); 1222 if (!nskb) 1223 return -ENOMEM; 1224 1225 /* copy target class to control buffer of new skb */ 1226 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class; 1227 1228 /* copy data fragment */ 1229 memcpy(nskb->data, skb->data + copied, size); 1230 copied += size; 1231 dataleft -= size; 1232 1233 skb_reset_transport_header(nskb); 1234 skb_reset_network_header(nskb); 1235 nskb->len = size; 1236 1237 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); 1238 } 1239 1240 return 0; 1241} 1242 1243/* iucv_process_message() - Receive a single outstanding IUCV message 1244 * 1245 * Locking: must be called with message_q.lock held 1246 */ 1247static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1248 struct iucv_path *path, 1249 struct iucv_message *msg) 1250{ 1251 int rc; 1252 unsigned int len; 1253 1254 len = iucv_msg_length(msg); 1255 1256 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1257 /* Note: the first 4 bytes are reserved for msg tag */ 1258 IUCV_SKB_CB(skb)->class = msg->class; 1259 1260 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1261 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1262 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1263 skb->data = NULL; 1264 skb->len = 0; 1265 } 1266 } else { 1267 rc = pr_iucv->message_receive(path, msg, 1268 msg->flags & IUCV_IPRMDATA, 1269 skb->data, len, NULL); 1270 if (rc) { 1271 kfree_skb(skb); 1272 return; 1273 } 1274 /* we need to fragment iucv messages for SOCK_STREAM only; 1275 * for SOCK_SEQPACKET, it is only relevant if we support 1276 * record segmentation using MSG_EOR (see also recvmsg()) */ 1277 if (sk->sk_type == SOCK_STREAM && 1278 skb->truesize >= sk->sk_rcvbuf / 4) { 1279 rc = iucv_fragment_skb(sk, skb, len); 1280 kfree_skb(skb); 1281 skb = NULL; 1282 if (rc) { 1283 pr_iucv->path_sever(path, NULL); 1284 return; 1285 } 1286 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); 1287 } else { 1288 skb_reset_transport_header(skb); 1289 skb_reset_network_header(skb); 1290 skb->len = len; 1291 } 1292 } 1293 1294 IUCV_SKB_CB(skb)->offset = 0; 1295 if (sock_queue_rcv_skb(sk, skb)) 1296 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); 1297} 1298 1299/* iucv_process_message_q() - Process outstanding IUCV messages 1300 * 1301 * Locking: must be called with message_q.lock held 1302 */ 1303static void iucv_process_message_q(struct sock *sk) 1304{ 1305 struct iucv_sock *iucv = iucv_sk(sk); 1306 struct sk_buff *skb; 1307 struct sock_msg_q *p, *n; 1308 1309 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1310 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); 1311 if (!skb) 1312 break; 1313 iucv_process_message(sk, skb, p->path, &p->msg); 1314 list_del(&p->list); 1315 kfree(p); 1316 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1317 break; 1318 } 1319} 1320 1321static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1322 size_t len, int flags) 1323{ 1324 int noblock = flags & MSG_DONTWAIT; 1325 struct sock *sk = sock->sk; 1326 struct iucv_sock *iucv = iucv_sk(sk); 1327 unsigned int copied, rlen; 1328 struct sk_buff *skb, *rskb, *cskb; 1329 int err = 0; 1330 u32 offset; 1331 1332 if ((sk->sk_state == IUCV_DISCONN) && 1333 skb_queue_empty(&iucv->backlog_skb_q) && 1334 skb_queue_empty(&sk->sk_receive_queue) && 1335 list_empty(&iucv->message_q.list)) 1336 return 0; 1337 1338 if (flags & (MSG_OOB)) 1339 return -EOPNOTSUPP; 1340 1341 /* receive/dequeue next skb: 1342 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1343 skb = skb_recv_datagram(sk, flags, noblock, &err); 1344 if (!skb) { 1345 if (sk->sk_shutdown & RCV_SHUTDOWN) 1346 return 0; 1347 return err; 1348 } 1349 1350 offset = IUCV_SKB_CB(skb)->offset; 1351 rlen = skb->len - offset; /* real length of skb */ 1352 copied = min_t(unsigned int, rlen, len); 1353 if (!rlen) 1354 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1355 1356 cskb = skb; 1357 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1358 if (!(flags & MSG_PEEK)) 1359 skb_queue_head(&sk->sk_receive_queue, skb); 1360 return -EFAULT; 1361 } 1362 1363 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1364 if (sk->sk_type == SOCK_SEQPACKET) { 1365 if (copied < rlen) 1366 msg->msg_flags |= MSG_TRUNC; 1367 /* each iucv message contains a complete record */ 1368 msg->msg_flags |= MSG_EOR; 1369 } 1370 1371 /* create control message to store iucv msg target class: 1372 * get the trgcls from the control buffer of the skb due to 1373 * fragmentation of original iucv message. */ 1374 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1375 sizeof(IUCV_SKB_CB(skb)->class), 1376 (void *)&IUCV_SKB_CB(skb)->class); 1377 if (err) { 1378 if (!(flags & MSG_PEEK)) 1379 skb_queue_head(&sk->sk_receive_queue, skb); 1380 return err; 1381 } 1382 1383 /* Mark read part of skb as used */ 1384 if (!(flags & MSG_PEEK)) { 1385 1386 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1387 if (sk->sk_type == SOCK_STREAM) { 1388 if (copied < rlen) { 1389 IUCV_SKB_CB(skb)->offset = offset + copied; 1390 skb_queue_head(&sk->sk_receive_queue, skb); 1391 goto done; 1392 } 1393 } 1394 1395 kfree_skb(skb); 1396 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1397 atomic_inc(&iucv->msg_recv); 1398 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1399 WARN_ON(1); 1400 iucv_sock_close(sk); 1401 return -EFAULT; 1402 } 1403 } 1404 1405 /* Queue backlog skbs */ 1406 spin_lock_bh(&iucv->message_q.lock); 1407 rskb = skb_dequeue(&iucv->backlog_skb_q); 1408 while (rskb) { 1409 IUCV_SKB_CB(rskb)->offset = 0; 1410 if (sock_queue_rcv_skb(sk, rskb)) { 1411 skb_queue_head(&iucv->backlog_skb_q, 1412 rskb); 1413 break; 1414 } else { 1415 rskb = skb_dequeue(&iucv->backlog_skb_q); 1416 } 1417 } 1418 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1419 if (!list_empty(&iucv->message_q.list)) 1420 iucv_process_message_q(sk); 1421 if (atomic_read(&iucv->msg_recv) >= 1422 iucv->msglimit / 2) { 1423 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1424 if (err) { 1425 sk->sk_state = IUCV_DISCONN; 1426 sk->sk_state_change(sk); 1427 } 1428 } 1429 } 1430 spin_unlock_bh(&iucv->message_q.lock); 1431 } 1432 1433done: 1434 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1435 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1436 copied = rlen; 1437 1438 return copied; 1439} 1440 1441static inline unsigned int iucv_accept_poll(struct sock *parent) 1442{ 1443 struct iucv_sock *isk, *n; 1444 struct sock *sk; 1445 1446 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1447 sk = (struct sock *) isk; 1448 1449 if (sk->sk_state == IUCV_CONNECTED) 1450 return POLLIN | POLLRDNORM; 1451 } 1452 1453 return 0; 1454} 1455 1456unsigned int iucv_sock_poll(struct file *file, struct socket *sock, 1457 poll_table *wait) 1458{ 1459 struct sock *sk = sock->sk; 1460 unsigned int mask = 0; 1461 1462 sock_poll_wait(file, sk_sleep(sk), wait); 1463 1464 if (sk->sk_state == IUCV_LISTEN) 1465 return iucv_accept_poll(sk); 1466 1467 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1468 mask |= POLLERR | 1469 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); 1470 1471 if (sk->sk_shutdown & RCV_SHUTDOWN) 1472 mask |= POLLRDHUP; 1473 1474 if (sk->sk_shutdown == SHUTDOWN_MASK) 1475 mask |= POLLHUP; 1476 1477 if (!skb_queue_empty(&sk->sk_receive_queue) || 1478 (sk->sk_shutdown & RCV_SHUTDOWN)) 1479 mask |= POLLIN | POLLRDNORM; 1480 1481 if (sk->sk_state == IUCV_CLOSED) 1482 mask |= POLLHUP; 1483 1484 if (sk->sk_state == IUCV_DISCONN) 1485 mask |= POLLIN; 1486 1487 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1488 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 1489 else 1490 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1491 1492 return mask; 1493} 1494 1495static int iucv_sock_shutdown(struct socket *sock, int how) 1496{ 1497 struct sock *sk = sock->sk; 1498 struct iucv_sock *iucv = iucv_sk(sk); 1499 struct iucv_message txmsg; 1500 int err = 0; 1501 1502 how++; 1503 1504 if ((how & ~SHUTDOWN_MASK) || !how) 1505 return -EINVAL; 1506 1507 lock_sock(sk); 1508 switch (sk->sk_state) { 1509 case IUCV_LISTEN: 1510 case IUCV_DISCONN: 1511 case IUCV_CLOSING: 1512 case IUCV_CLOSED: 1513 err = -ENOTCONN; 1514 goto fail; 1515 default: 1516 break; 1517 } 1518 1519 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1520 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1521 txmsg.class = 0; 1522 txmsg.tag = 0; 1523 err = pr_iucv->message_send(iucv->path, &txmsg, 1524 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1525 if (err) { 1526 switch (err) { 1527 case 1: 1528 err = -ENOTCONN; 1529 break; 1530 case 2: 1531 err = -ECONNRESET; 1532 break; 1533 default: 1534 err = -ENOTCONN; 1535 break; 1536 } 1537 } 1538 } else 1539 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1540 } 1541 1542 sk->sk_shutdown |= how; 1543 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1544 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1545 iucv->path) { 1546 err = pr_iucv->path_quiesce(iucv->path, NULL); 1547 if (err) 1548 err = -ENOTCONN; 1549/* skb_queue_purge(&sk->sk_receive_queue); */ 1550 } 1551 skb_queue_purge(&sk->sk_receive_queue); 1552 } 1553 1554 /* Wake up anyone sleeping in poll */ 1555 sk->sk_state_change(sk); 1556 1557fail: 1558 release_sock(sk); 1559 return err; 1560} 1561 1562static int iucv_sock_release(struct socket *sock) 1563{ 1564 struct sock *sk = sock->sk; 1565 int err = 0; 1566 1567 if (!sk) 1568 return 0; 1569 1570 iucv_sock_close(sk); 1571 1572 sock_orphan(sk); 1573 iucv_sock_kill(sk); 1574 return err; 1575} 1576 1577/* getsockopt and setsockopt */ 1578static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1579 char __user *optval, unsigned int optlen) 1580{ 1581 struct sock *sk = sock->sk; 1582 struct iucv_sock *iucv = iucv_sk(sk); 1583 int val; 1584 int rc; 1585 1586 if (level != SOL_IUCV) 1587 return -ENOPROTOOPT; 1588 1589 if (optlen < sizeof(int)) 1590 return -EINVAL; 1591 1592 if (get_user(val, (int __user *) optval)) 1593 return -EFAULT; 1594 1595 rc = 0; 1596 1597 lock_sock(sk); 1598 switch (optname) { 1599 case SO_IPRMDATA_MSG: 1600 if (val) 1601 iucv->flags |= IUCV_IPRMDATA; 1602 else 1603 iucv->flags &= ~IUCV_IPRMDATA; 1604 break; 1605 case SO_MSGLIMIT: 1606 switch (sk->sk_state) { 1607 case IUCV_OPEN: 1608 case IUCV_BOUND: 1609 if (val < 1 || val > (u16)(~0)) 1610 rc = -EINVAL; 1611 else 1612 iucv->msglimit = val; 1613 break; 1614 default: 1615 rc = -EINVAL; 1616 break; 1617 } 1618 break; 1619 default: 1620 rc = -ENOPROTOOPT; 1621 break; 1622 } 1623 release_sock(sk); 1624 1625 return rc; 1626} 1627 1628static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1629 char __user *optval, int __user *optlen) 1630{ 1631 struct sock *sk = sock->sk; 1632 struct iucv_sock *iucv = iucv_sk(sk); 1633 unsigned int val; 1634 int len; 1635 1636 if (level != SOL_IUCV) 1637 return -ENOPROTOOPT; 1638 1639 if (get_user(len, optlen)) 1640 return -EFAULT; 1641 1642 if (len < 0) 1643 return -EINVAL; 1644 1645 len = min_t(unsigned int, len, sizeof(int)); 1646 1647 switch (optname) { 1648 case SO_IPRMDATA_MSG: 1649 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1650 break; 1651 case SO_MSGLIMIT: 1652 lock_sock(sk); 1653 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1654 : iucv->msglimit; /* default */ 1655 release_sock(sk); 1656 break; 1657 case SO_MSGSIZE: 1658 if (sk->sk_state == IUCV_OPEN) 1659 return -EBADFD; 1660 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1661 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1662 0x7fffffff; 1663 break; 1664 default: 1665 return -ENOPROTOOPT; 1666 } 1667 1668 if (put_user(len, optlen)) 1669 return -EFAULT; 1670 if (copy_to_user(optval, &val, len)) 1671 return -EFAULT; 1672 1673 return 0; 1674} 1675 1676 1677/* Callback wrappers - called from iucv base support */ 1678static int iucv_callback_connreq(struct iucv_path *path, 1679 u8 ipvmid[8], u8 ipuser[16]) 1680{ 1681 unsigned char user_data[16]; 1682 unsigned char nuser_data[16]; 1683 unsigned char src_name[8]; 1684 struct sock *sk, *nsk; 1685 struct iucv_sock *iucv, *niucv; 1686 int err; 1687 1688 memcpy(src_name, ipuser, 8); 1689 EBCASC(src_name, 8); 1690 /* Find out if this path belongs to af_iucv. */ 1691 read_lock(&iucv_sk_list.lock); 1692 iucv = NULL; 1693 sk = NULL; 1694 sk_for_each(sk, &iucv_sk_list.head) 1695 if (sk->sk_state == IUCV_LISTEN && 1696 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1697 /* 1698 * Found a listening socket with 1699 * src_name == ipuser[0-7]. 1700 */ 1701 iucv = iucv_sk(sk); 1702 break; 1703 } 1704 read_unlock(&iucv_sk_list.lock); 1705 if (!iucv) 1706 /* No socket found, not one of our paths. */ 1707 return -EINVAL; 1708 1709 bh_lock_sock(sk); 1710 1711 /* Check if parent socket is listening */ 1712 low_nmcpy(user_data, iucv->src_name); 1713 high_nmcpy(user_data, iucv->dst_name); 1714 ASCEBC(user_data, sizeof(user_data)); 1715 if (sk->sk_state != IUCV_LISTEN) { 1716 err = pr_iucv->path_sever(path, user_data); 1717 iucv_path_free(path); 1718 goto fail; 1719 } 1720 1721 /* Check for backlog size */ 1722 if (sk_acceptq_is_full(sk)) { 1723 err = pr_iucv->path_sever(path, user_data); 1724 iucv_path_free(path); 1725 goto fail; 1726 } 1727 1728 /* Create the new socket */ 1729 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); 1730 if (!nsk) { 1731 err = pr_iucv->path_sever(path, user_data); 1732 iucv_path_free(path); 1733 goto fail; 1734 } 1735 1736 niucv = iucv_sk(nsk); 1737 iucv_sock_init(nsk, sk); 1738 1739 /* Set the new iucv_sock */ 1740 memcpy(niucv->dst_name, ipuser + 8, 8); 1741 EBCASC(niucv->dst_name, 8); 1742 memcpy(niucv->dst_user_id, ipvmid, 8); 1743 memcpy(niucv->src_name, iucv->src_name, 8); 1744 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1745 niucv->path = path; 1746 1747 /* Call iucv_accept */ 1748 high_nmcpy(nuser_data, ipuser + 8); 1749 memcpy(nuser_data + 8, niucv->src_name, 8); 1750 ASCEBC(nuser_data + 8, 8); 1751 1752 /* set message limit for path based on msglimit of accepting socket */ 1753 niucv->msglimit = iucv->msglimit; 1754 path->msglim = iucv->msglimit; 1755 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1756 if (err) { 1757 iucv_sever_path(nsk, 1); 1758 iucv_sock_kill(nsk); 1759 goto fail; 1760 } 1761 1762 iucv_accept_enqueue(sk, nsk); 1763 1764 /* Wake up accept */ 1765 nsk->sk_state = IUCV_CONNECTED; 1766 sk->sk_data_ready(sk); 1767 err = 0; 1768fail: 1769 bh_unlock_sock(sk); 1770 return 0; 1771} 1772 1773static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1774{ 1775 struct sock *sk = path->private; 1776 1777 sk->sk_state = IUCV_CONNECTED; 1778 sk->sk_state_change(sk); 1779} 1780 1781static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1782{ 1783 struct sock *sk = path->private; 1784 struct iucv_sock *iucv = iucv_sk(sk); 1785 struct sk_buff *skb; 1786 struct sock_msg_q *save_msg; 1787 int len; 1788 1789 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1790 pr_iucv->message_reject(path, msg); 1791 return; 1792 } 1793 1794 spin_lock(&iucv->message_q.lock); 1795 1796 if (!list_empty(&iucv->message_q.list) || 1797 !skb_queue_empty(&iucv->backlog_skb_q)) 1798 goto save_message; 1799 1800 len = atomic_read(&sk->sk_rmem_alloc); 1801 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1802 if (len > sk->sk_rcvbuf) 1803 goto save_message; 1804 1805 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); 1806 if (!skb) 1807 goto save_message; 1808 1809 iucv_process_message(sk, skb, path, msg); 1810 goto out_unlock; 1811 1812save_message: 1813 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1814 if (!save_msg) 1815 goto out_unlock; 1816 save_msg->path = path; 1817 save_msg->msg = *msg; 1818 1819 list_add_tail(&save_msg->list, &iucv->message_q.list); 1820 1821out_unlock: 1822 spin_unlock(&iucv->message_q.lock); 1823} 1824 1825static void iucv_callback_txdone(struct iucv_path *path, 1826 struct iucv_message *msg) 1827{ 1828 struct sock *sk = path->private; 1829 struct sk_buff *this = NULL; 1830 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1831 struct sk_buff *list_skb = list->next; 1832 unsigned long flags; 1833 1834 bh_lock_sock(sk); 1835 if (!skb_queue_empty(list)) { 1836 spin_lock_irqsave(&list->lock, flags); 1837 1838 while (list_skb != (struct sk_buff *)list) { 1839 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1840 this = list_skb; 1841 break; 1842 } 1843 list_skb = list_skb->next; 1844 } 1845 if (this) 1846 __skb_unlink(this, list); 1847 1848 spin_unlock_irqrestore(&list->lock, flags); 1849 1850 if (this) { 1851 kfree_skb(this); 1852 /* wake up any process waiting for sending */ 1853 iucv_sock_wake_msglim(sk); 1854 } 1855 } 1856 1857 if (sk->sk_state == IUCV_CLOSING) { 1858 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1859 sk->sk_state = IUCV_CLOSED; 1860 sk->sk_state_change(sk); 1861 } 1862 } 1863 bh_unlock_sock(sk); 1864 1865} 1866 1867static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1868{ 1869 struct sock *sk = path->private; 1870 1871 if (sk->sk_state == IUCV_CLOSED) 1872 return; 1873 1874 bh_lock_sock(sk); 1875 iucv_sever_path(sk, 1); 1876 sk->sk_state = IUCV_DISCONN; 1877 1878 sk->sk_state_change(sk); 1879 bh_unlock_sock(sk); 1880} 1881 1882/* called if the other communication side shuts down its RECV direction; 1883 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1884 */ 1885static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1886{ 1887 struct sock *sk = path->private; 1888 1889 bh_lock_sock(sk); 1890 if (sk->sk_state != IUCV_CLOSED) { 1891 sk->sk_shutdown |= SEND_SHUTDOWN; 1892 sk->sk_state_change(sk); 1893 } 1894 bh_unlock_sock(sk); 1895} 1896 1897/***************** HiperSockets transport callbacks ********************/ 1898static void afiucv_swap_src_dest(struct sk_buff *skb) 1899{ 1900 struct af_iucv_trans_hdr *trans_hdr = 1901 (struct af_iucv_trans_hdr *)skb->data; 1902 char tmpID[8]; 1903 char tmpName[8]; 1904 1905 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1906 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1907 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1908 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1909 memcpy(tmpID, trans_hdr->srcUserID, 8); 1910 memcpy(tmpName, trans_hdr->srcAppName, 8); 1911 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1912 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1913 memcpy(trans_hdr->destUserID, tmpID, 8); 1914 memcpy(trans_hdr->destAppName, tmpName, 8); 1915 skb_push(skb, ETH_HLEN); 1916 memset(skb->data, 0, ETH_HLEN); 1917} 1918 1919/** 1920 * afiucv_hs_callback_syn - react on received SYN 1921 **/ 1922static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1923{ 1924 struct sock *nsk; 1925 struct iucv_sock *iucv, *niucv; 1926 struct af_iucv_trans_hdr *trans_hdr; 1927 int err; 1928 1929 iucv = iucv_sk(sk); 1930 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 1931 if (!iucv) { 1932 /* no sock - connection refused */ 1933 afiucv_swap_src_dest(skb); 1934 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1935 err = dev_queue_xmit(skb); 1936 goto out; 1937 } 1938 1939 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); 1940 bh_lock_sock(sk); 1941 if ((sk->sk_state != IUCV_LISTEN) || 1942 sk_acceptq_is_full(sk) || 1943 !nsk) { 1944 /* error on server socket - connection refused */ 1945 afiucv_swap_src_dest(skb); 1946 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1947 err = dev_queue_xmit(skb); 1948 iucv_sock_kill(nsk); 1949 bh_unlock_sock(sk); 1950 goto out; 1951 } 1952 1953 niucv = iucv_sk(nsk); 1954 iucv_sock_init(nsk, sk); 1955 niucv->transport = AF_IUCV_TRANS_HIPER; 1956 niucv->msglimit = iucv->msglimit; 1957 if (!trans_hdr->window) 1958 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1959 else 1960 niucv->msglimit_peer = trans_hdr->window; 1961 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1962 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1963 memcpy(niucv->src_name, iucv->src_name, 8); 1964 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1965 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1966 niucv->hs_dev = iucv->hs_dev; 1967 dev_hold(niucv->hs_dev); 1968 afiucv_swap_src_dest(skb); 1969 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1970 trans_hdr->window = niucv->msglimit; 1971 /* if receiver acks the xmit connection is established */ 1972 err = dev_queue_xmit(skb); 1973 if (!err) { 1974 iucv_accept_enqueue(sk, nsk); 1975 nsk->sk_state = IUCV_CONNECTED; 1976 sk->sk_data_ready(sk); 1977 } else 1978 iucv_sock_kill(nsk); 1979 bh_unlock_sock(sk); 1980 1981out: 1982 return NET_RX_SUCCESS; 1983} 1984 1985/** 1986 * afiucv_hs_callback_synack() - react on received SYN-ACK 1987 **/ 1988static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1989{ 1990 struct iucv_sock *iucv = iucv_sk(sk); 1991 struct af_iucv_trans_hdr *trans_hdr = 1992 (struct af_iucv_trans_hdr *)skb->data; 1993 1994 if (!iucv) 1995 goto out; 1996 if (sk->sk_state != IUCV_BOUND) 1997 goto out; 1998 bh_lock_sock(sk); 1999 iucv->msglimit_peer = trans_hdr->window; 2000 sk->sk_state = IUCV_CONNECTED; 2001 sk->sk_state_change(sk); 2002 bh_unlock_sock(sk); 2003out: 2004 kfree_skb(skb); 2005 return NET_RX_SUCCESS; 2006} 2007 2008/** 2009 * afiucv_hs_callback_synfin() - react on received SYN_FIN 2010 **/ 2011static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 2012{ 2013 struct iucv_sock *iucv = iucv_sk(sk); 2014 2015 if (!iucv) 2016 goto out; 2017 if (sk->sk_state != IUCV_BOUND) 2018 goto out; 2019 bh_lock_sock(sk); 2020 sk->sk_state = IUCV_DISCONN; 2021 sk->sk_state_change(sk); 2022 bh_unlock_sock(sk); 2023out: 2024 kfree_skb(skb); 2025 return NET_RX_SUCCESS; 2026} 2027 2028/** 2029 * afiucv_hs_callback_fin() - react on received FIN 2030 **/ 2031static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 2032{ 2033 struct iucv_sock *iucv = iucv_sk(sk); 2034 2035 /* other end of connection closed */ 2036 if (!iucv) 2037 goto out; 2038 bh_lock_sock(sk); 2039 if (sk->sk_state == IUCV_CONNECTED) { 2040 sk->sk_state = IUCV_DISCONN; 2041 sk->sk_state_change(sk); 2042 } 2043 bh_unlock_sock(sk); 2044out: 2045 kfree_skb(skb); 2046 return NET_RX_SUCCESS; 2047} 2048 2049/** 2050 * afiucv_hs_callback_win() - react on received WIN 2051 **/ 2052static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2053{ 2054 struct iucv_sock *iucv = iucv_sk(sk); 2055 struct af_iucv_trans_hdr *trans_hdr = 2056 (struct af_iucv_trans_hdr *)skb->data; 2057 2058 if (!iucv) 2059 return NET_RX_SUCCESS; 2060 2061 if (sk->sk_state != IUCV_CONNECTED) 2062 return NET_RX_SUCCESS; 2063 2064 atomic_sub(trans_hdr->window, &iucv->msg_sent); 2065 iucv_sock_wake_msglim(sk); 2066 return NET_RX_SUCCESS; 2067} 2068 2069/** 2070 * afiucv_hs_callback_rx() - react on received data 2071 **/ 2072static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2073{ 2074 struct iucv_sock *iucv = iucv_sk(sk); 2075 2076 if (!iucv) { 2077 kfree_skb(skb); 2078 return NET_RX_SUCCESS; 2079 } 2080 2081 if (sk->sk_state != IUCV_CONNECTED) { 2082 kfree_skb(skb); 2083 return NET_RX_SUCCESS; 2084 } 2085 2086 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2087 kfree_skb(skb); 2088 return NET_RX_SUCCESS; 2089 } 2090 2091 /* write stuff from iucv_msg to skb cb */ 2092 if (skb->len < sizeof(struct af_iucv_trans_hdr)) { 2093 kfree_skb(skb); 2094 return NET_RX_SUCCESS; 2095 } 2096 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2097 skb_reset_transport_header(skb); 2098 skb_reset_network_header(skb); 2099 IUCV_SKB_CB(skb)->offset = 0; 2100 spin_lock(&iucv->message_q.lock); 2101 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2102 if (sock_queue_rcv_skb(sk, skb)) { 2103 /* handle rcv queue full */ 2104 skb_queue_tail(&iucv->backlog_skb_q, skb); 2105 } 2106 } else 2107 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2108 spin_unlock(&iucv->message_q.lock); 2109 return NET_RX_SUCCESS; 2110} 2111 2112/** 2113 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2114 * transport 2115 * called from netif RX softirq 2116 **/ 2117static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2118 struct packet_type *pt, struct net_device *orig_dev) 2119{ 2120 struct sock *sk; 2121 struct iucv_sock *iucv; 2122 struct af_iucv_trans_hdr *trans_hdr; 2123 char nullstring[8]; 2124 int err = 0; 2125 2126 skb_pull(skb, ETH_HLEN); 2127 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 2128 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2129 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2130 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2131 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2132 memset(nullstring, 0, sizeof(nullstring)); 2133 iucv = NULL; 2134 sk = NULL; 2135 read_lock(&iucv_sk_list.lock); 2136 sk_for_each(sk, &iucv_sk_list.head) { 2137 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2138 if ((!memcmp(&iucv_sk(sk)->src_name, 2139 trans_hdr->destAppName, 8)) && 2140 (!memcmp(&iucv_sk(sk)->src_user_id, 2141 trans_hdr->destUserID, 8)) && 2142 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2143 (!memcmp(&iucv_sk(sk)->dst_user_id, 2144 nullstring, 8))) { 2145 iucv = iucv_sk(sk); 2146 break; 2147 } 2148 } else { 2149 if ((!memcmp(&iucv_sk(sk)->src_name, 2150 trans_hdr->destAppName, 8)) && 2151 (!memcmp(&iucv_sk(sk)->src_user_id, 2152 trans_hdr->destUserID, 8)) && 2153 (!memcmp(&iucv_sk(sk)->dst_name, 2154 trans_hdr->srcAppName, 8)) && 2155 (!memcmp(&iucv_sk(sk)->dst_user_id, 2156 trans_hdr->srcUserID, 8))) { 2157 iucv = iucv_sk(sk); 2158 break; 2159 } 2160 } 2161 } 2162 read_unlock(&iucv_sk_list.lock); 2163 if (!iucv) 2164 sk = NULL; 2165 2166 /* no sock 2167 how should we send with no sock 2168 1) send without sock no send rc checking? 2169 2) introduce default sock to handle this cases 2170 2171 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2172 data -> send FIN 2173 SYN|ACK, SYN|FIN, FIN -> no action? */ 2174 2175 switch (trans_hdr->flags) { 2176 case AF_IUCV_FLAG_SYN: 2177 /* connect request */ 2178 err = afiucv_hs_callback_syn(sk, skb); 2179 break; 2180 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2181 /* connect request confirmed */ 2182 err = afiucv_hs_callback_synack(sk, skb); 2183 break; 2184 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2185 /* connect request refused */ 2186 err = afiucv_hs_callback_synfin(sk, skb); 2187 break; 2188 case (AF_IUCV_FLAG_FIN): 2189 /* close request */ 2190 err = afiucv_hs_callback_fin(sk, skb); 2191 break; 2192 case (AF_IUCV_FLAG_WIN): 2193 err = afiucv_hs_callback_win(sk, skb); 2194 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2195 kfree_skb(skb); 2196 break; 2197 } 2198 /* fall through and receive non-zero length data */ 2199 case (AF_IUCV_FLAG_SHT): 2200 /* shutdown request */ 2201 /* fall through and receive zero length data */ 2202 case 0: 2203 /* plain data frame */ 2204 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2205 err = afiucv_hs_callback_rx(sk, skb); 2206 break; 2207 default: 2208 ; 2209 } 2210 2211 return err; 2212} 2213 2214/** 2215 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2216 * transport 2217 **/ 2218static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2219 enum iucv_tx_notify n) 2220{ 2221 struct sock *isk = skb->sk; 2222 struct sock *sk = NULL; 2223 struct iucv_sock *iucv = NULL; 2224 struct sk_buff_head *list; 2225 struct sk_buff *list_skb; 2226 struct sk_buff *nskb; 2227 unsigned long flags; 2228 2229 read_lock_irqsave(&iucv_sk_list.lock, flags); 2230 sk_for_each(sk, &iucv_sk_list.head) 2231 if (sk == isk) { 2232 iucv = iucv_sk(sk); 2233 break; 2234 } 2235 read_unlock_irqrestore(&iucv_sk_list.lock, flags); 2236 2237 if (!iucv || sock_flag(sk, SOCK_ZAPPED)) 2238 return; 2239 2240 list = &iucv->send_skb_q; 2241 spin_lock_irqsave(&list->lock, flags); 2242 if (skb_queue_empty(list)) 2243 goto out_unlock; 2244 list_skb = list->next; 2245 nskb = list_skb->next; 2246 while (list_skb != (struct sk_buff *)list) { 2247 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2248 switch (n) { 2249 case TX_NOTIFY_OK: 2250 __skb_unlink(list_skb, list); 2251 kfree_skb(list_skb); 2252 iucv_sock_wake_msglim(sk); 2253 break; 2254 case TX_NOTIFY_PENDING: 2255 atomic_inc(&iucv->pendings); 2256 break; 2257 case TX_NOTIFY_DELAYED_OK: 2258 __skb_unlink(list_skb, list); 2259 atomic_dec(&iucv->pendings); 2260 if (atomic_read(&iucv->pendings) <= 0) 2261 iucv_sock_wake_msglim(sk); 2262 kfree_skb(list_skb); 2263 break; 2264 case TX_NOTIFY_UNREACHABLE: 2265 case TX_NOTIFY_DELAYED_UNREACHABLE: 2266 case TX_NOTIFY_TPQFULL: /* not yet used */ 2267 case TX_NOTIFY_GENERALERROR: 2268 case TX_NOTIFY_DELAYED_GENERALERROR: 2269 __skb_unlink(list_skb, list); 2270 kfree_skb(list_skb); 2271 if (sk->sk_state == IUCV_CONNECTED) { 2272 sk->sk_state = IUCV_DISCONN; 2273 sk->sk_state_change(sk); 2274 } 2275 break; 2276 } 2277 break; 2278 } 2279 list_skb = nskb; 2280 nskb = nskb->next; 2281 } 2282out_unlock: 2283 spin_unlock_irqrestore(&list->lock, flags); 2284 2285 if (sk->sk_state == IUCV_CLOSING) { 2286 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2287 sk->sk_state = IUCV_CLOSED; 2288 sk->sk_state_change(sk); 2289 } 2290 } 2291 2292} 2293 2294/* 2295 * afiucv_netdev_event: handle netdev notifier chain events 2296 */ 2297static int afiucv_netdev_event(struct notifier_block *this, 2298 unsigned long event, void *ptr) 2299{ 2300 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2301 struct sock *sk; 2302 struct iucv_sock *iucv; 2303 2304 switch (event) { 2305 case NETDEV_REBOOT: 2306 case NETDEV_GOING_DOWN: 2307 sk_for_each(sk, &iucv_sk_list.head) { 2308 iucv = iucv_sk(sk); 2309 if ((iucv->hs_dev == event_dev) && 2310 (sk->sk_state == IUCV_CONNECTED)) { 2311 if (event == NETDEV_GOING_DOWN) 2312 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2313 sk->sk_state = IUCV_DISCONN; 2314 sk->sk_state_change(sk); 2315 } 2316 } 2317 break; 2318 case NETDEV_DOWN: 2319 case NETDEV_UNREGISTER: 2320 default: 2321 break; 2322 } 2323 return NOTIFY_DONE; 2324} 2325 2326static struct notifier_block afiucv_netdev_notifier = { 2327 .notifier_call = afiucv_netdev_event, 2328}; 2329 2330static const struct proto_ops iucv_sock_ops = { 2331 .family = PF_IUCV, 2332 .owner = THIS_MODULE, 2333 .release = iucv_sock_release, 2334 .bind = iucv_sock_bind, 2335 .connect = iucv_sock_connect, 2336 .listen = iucv_sock_listen, 2337 .accept = iucv_sock_accept, 2338 .getname = iucv_sock_getname, 2339 .sendmsg = iucv_sock_sendmsg, 2340 .recvmsg = iucv_sock_recvmsg, 2341 .poll = iucv_sock_poll, 2342 .ioctl = sock_no_ioctl, 2343 .mmap = sock_no_mmap, 2344 .socketpair = sock_no_socketpair, 2345 .shutdown = iucv_sock_shutdown, 2346 .setsockopt = iucv_sock_setsockopt, 2347 .getsockopt = iucv_sock_getsockopt, 2348}; 2349 2350static const struct net_proto_family iucv_sock_family_ops = { 2351 .family = AF_IUCV, 2352 .owner = THIS_MODULE, 2353 .create = iucv_sock_create, 2354}; 2355 2356static struct packet_type iucv_packet_type = { 2357 .type = cpu_to_be16(ETH_P_AF_IUCV), 2358 .func = afiucv_hs_rcv, 2359}; 2360 2361static int afiucv_iucv_init(void) 2362{ 2363 int err; 2364 2365 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2366 if (err) 2367 goto out; 2368 /* establish dummy device */ 2369 af_iucv_driver.bus = pr_iucv->bus; 2370 err = driver_register(&af_iucv_driver); 2371 if (err) 2372 goto out_iucv; 2373 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 2374 if (!af_iucv_dev) { 2375 err = -ENOMEM; 2376 goto out_driver; 2377 } 2378 dev_set_name(af_iucv_dev, "af_iucv"); 2379 af_iucv_dev->bus = pr_iucv->bus; 2380 af_iucv_dev->parent = pr_iucv->root; 2381 af_iucv_dev->release = (void (*)(struct device *))kfree; 2382 af_iucv_dev->driver = &af_iucv_driver; 2383 err = device_register(af_iucv_dev); 2384 if (err) 2385 goto out_driver; 2386 return 0; 2387 2388out_driver: 2389 driver_unregister(&af_iucv_driver); 2390out_iucv: 2391 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2392out: 2393 return err; 2394} 2395 2396static int __init afiucv_init(void) 2397{ 2398 int err; 2399 2400 if (MACHINE_IS_VM) { 2401 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2402 if (unlikely(err)) { 2403 WARN_ON(err); 2404 err = -EPROTONOSUPPORT; 2405 goto out; 2406 } 2407 2408 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2409 if (!pr_iucv) { 2410 printk(KERN_WARNING "iucv_if lookup failed\n"); 2411 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2412 } 2413 } else { 2414 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2415 pr_iucv = NULL; 2416 } 2417 2418 err = proto_register(&iucv_proto, 0); 2419 if (err) 2420 goto out; 2421 err = sock_register(&iucv_sock_family_ops); 2422 if (err) 2423 goto out_proto; 2424 2425 if (pr_iucv) { 2426 err = afiucv_iucv_init(); 2427 if (err) 2428 goto out_sock; 2429 } else 2430 register_netdevice_notifier(&afiucv_netdev_notifier); 2431 dev_add_pack(&iucv_packet_type); 2432 return 0; 2433 2434out_sock: 2435 sock_unregister(PF_IUCV); 2436out_proto: 2437 proto_unregister(&iucv_proto); 2438out: 2439 if (pr_iucv) 2440 symbol_put(iucv_if); 2441 return err; 2442} 2443 2444static void __exit afiucv_exit(void) 2445{ 2446 if (pr_iucv) { 2447 device_unregister(af_iucv_dev); 2448 driver_unregister(&af_iucv_driver); 2449 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2450 symbol_put(iucv_if); 2451 } else 2452 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2453 dev_remove_pack(&iucv_packet_type); 2454 sock_unregister(PF_IUCV); 2455 proto_unregister(&iucv_proto); 2456} 2457 2458module_init(afiucv_init); 2459module_exit(afiucv_exit); 2460 2461MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2462MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2463MODULE_VERSION(VERSION); 2464MODULE_LICENSE("GPL"); 2465MODULE_ALIAS_NETPROTO(PF_IUCV); 2466 2467