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/signal.h> 21 #include <linux/slab.h> 22 #include <linux/skbuff.h> 23 #include <linux/init.h> 24 #include <linux/poll.h> 25 #include <linux/security.h> 26 #include <net/sock.h> 27 #include <asm/ebcdic.h> 28 #include <asm/cpcmd.h> 29 #include <linux/kmod.h> 30 31 #include <net/iucv/af_iucv.h> 32 33 #define VERSION "1.2" 34 35 static char iucv_userid[80]; 36 37 static const struct proto_ops iucv_sock_ops; 38 39 static struct proto iucv_proto = { 40 .name = "AF_IUCV", 41 .owner = THIS_MODULE, 42 .obj_size = sizeof(struct iucv_sock), 43 }; 44 45 static struct iucv_interface *pr_iucv; 46 47 /* special AF_IUCV IPRM messages */ 48 static const u8 iprm_shutdown[8] = 49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 50 51 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) 52 53 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 54 do { \ 55 DEFINE_WAIT(__wait); \ 56 long __timeo = timeo; \ 57 ret = 0; \ 58 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 59 while (!(condition)) { \ 60 if (!__timeo) { \ 61 ret = -EAGAIN; \ 62 break; \ 63 } \ 64 if (signal_pending(current)) { \ 65 ret = sock_intr_errno(__timeo); \ 66 break; \ 67 } \ 68 release_sock(sk); \ 69 __timeo = schedule_timeout(__timeo); \ 70 lock_sock(sk); \ 71 ret = sock_error(sk); \ 72 if (ret) \ 73 break; \ 74 } \ 75 finish_wait(sk_sleep(sk), &__wait); \ 76 } while (0) 77 78 #define iucv_sock_wait(sk, condition, timeo) \ 79 ({ \ 80 int __ret = 0; \ 81 if (!(condition)) \ 82 __iucv_sock_wait(sk, condition, timeo, __ret); \ 83 __ret; \ 84 }) 85 86 static void iucv_sock_kill(struct sock *sk); 87 static void iucv_sock_close(struct sock *sk); 88 static void iucv_sever_path(struct sock *, int); 89 90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 91 struct packet_type *pt, struct net_device *orig_dev); 92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 93 struct sk_buff *skb, u8 flags); 94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); 95 96 /* Call Back functions */ 97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 99 static void iucv_callback_connack(struct iucv_path *, u8 *); 100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *); 101 static void iucv_callback_connrej(struct iucv_path *, u8 *); 102 static void iucv_callback_shutdown(struct iucv_path *, u8 *); 103 104 static struct iucv_sock_list iucv_sk_list = { 105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 106 .autobind_name = ATOMIC_INIT(0) 107 }; 108 109 static 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 }; 117 118 static inline void high_nmcpy(unsigned char *dst, char *src) 119 { 120 memcpy(dst, src, 8); 121 } 122 123 static inline void low_nmcpy(unsigned char *dst, char *src) 124 { 125 memcpy(&dst[8], src, 8); 126 } 127 128 static 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 } 135 136 static 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 */ 149 static 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 */ 187 static 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 } 214 215 static 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 }; 222 223 static 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 */ 231 static 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 */ 253 static 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 */ 272 static 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 */ 285 static 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 */ 301 static 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 (skwq_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 */ 316 static 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 } 381 382 static 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 } 392 393 static 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 */ 412 static 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) */ 426 static 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 */ 437 static 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 controlling flags through an IUCV socket for HIPER transport */ 457 static int iucv_send_ctrl(struct sock *sk, u8 flags) 458 { 459 int err = 0; 460 int blen; 461 struct sk_buff *skb; 462 u8 shutdown = 0; 463 464 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 465 if (sk->sk_shutdown & SEND_SHUTDOWN) { 466 /* controlling flags should be sent anyway */ 467 shutdown = sk->sk_shutdown; 468 sk->sk_shutdown &= RCV_SHUTDOWN; 469 } 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, flags); 474 } 475 if (shutdown) 476 sk->sk_shutdown = shutdown; 477 return err; 478 } 479 480 /* Close an IUCV socket */ 481 static void iucv_sock_close(struct sock *sk) 482 { 483 struct iucv_sock *iucv = iucv_sk(sk); 484 unsigned long timeo; 485 int err = 0; 486 487 lock_sock(sk); 488 489 switch (sk->sk_state) { 490 case IUCV_LISTEN: 491 iucv_sock_cleanup_listen(sk); 492 break; 493 494 case IUCV_CONNECTED: 495 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 496 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 497 sk->sk_state = IUCV_DISCONN; 498 sk->sk_state_change(sk); 499 } 500 case IUCV_DISCONN: /* fall through */ 501 sk->sk_state = IUCV_CLOSING; 502 sk->sk_state_change(sk); 503 504 if (!err && !skb_queue_empty(&iucv->send_skb_q)) { 505 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 506 timeo = sk->sk_lingertime; 507 else 508 timeo = IUCV_DISCONN_TIMEOUT; 509 iucv_sock_wait(sk, 510 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 511 timeo); 512 } 513 514 case IUCV_CLOSING: /* fall through */ 515 sk->sk_state = IUCV_CLOSED; 516 sk->sk_state_change(sk); 517 518 sk->sk_err = ECONNRESET; 519 sk->sk_state_change(sk); 520 521 skb_queue_purge(&iucv->send_skb_q); 522 skb_queue_purge(&iucv->backlog_skb_q); 523 524 default: /* fall through */ 525 iucv_sever_path(sk, 1); 526 } 527 528 if (iucv->hs_dev) { 529 dev_put(iucv->hs_dev); 530 iucv->hs_dev = NULL; 531 sk->sk_bound_dev_if = 0; 532 } 533 534 /* mark socket for deletion by iucv_sock_kill() */ 535 sock_set_flag(sk, SOCK_ZAPPED); 536 537 release_sock(sk); 538 } 539 540 static void iucv_sock_init(struct sock *sk, struct sock *parent) 541 { 542 if (parent) { 543 sk->sk_type = parent->sk_type; 544 security_sk_clone(parent, sk); 545 } 546 } 547 548 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 549 { 550 struct sock *sk; 551 struct iucv_sock *iucv; 552 553 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 554 if (!sk) 555 return NULL; 556 iucv = iucv_sk(sk); 557 558 sock_init_data(sock, sk); 559 INIT_LIST_HEAD(&iucv->accept_q); 560 spin_lock_init(&iucv->accept_q_lock); 561 skb_queue_head_init(&iucv->send_skb_q); 562 INIT_LIST_HEAD(&iucv->message_q.list); 563 spin_lock_init(&iucv->message_q.lock); 564 skb_queue_head_init(&iucv->backlog_skb_q); 565 iucv->send_tag = 0; 566 atomic_set(&iucv->pendings, 0); 567 iucv->flags = 0; 568 iucv->msglimit = 0; 569 atomic_set(&iucv->msg_sent, 0); 570 atomic_set(&iucv->msg_recv, 0); 571 iucv->path = NULL; 572 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 573 memset(&iucv->src_user_id , 0, 32); 574 if (pr_iucv) 575 iucv->transport = AF_IUCV_TRANS_IUCV; 576 else 577 iucv->transport = AF_IUCV_TRANS_HIPER; 578 579 sk->sk_destruct = iucv_sock_destruct; 580 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 581 sk->sk_allocation = GFP_DMA; 582 583 sock_reset_flag(sk, SOCK_ZAPPED); 584 585 sk->sk_protocol = proto; 586 sk->sk_state = IUCV_OPEN; 587 588 iucv_sock_link(&iucv_sk_list, sk); 589 return sk; 590 } 591 592 /* Create an IUCV socket */ 593 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 594 int kern) 595 { 596 struct sock *sk; 597 598 if (protocol && protocol != PF_IUCV) 599 return -EPROTONOSUPPORT; 600 601 sock->state = SS_UNCONNECTED; 602 603 switch (sock->type) { 604 case SOCK_STREAM: 605 sock->ops = &iucv_sock_ops; 606 break; 607 case SOCK_SEQPACKET: 608 /* currently, proto ops can handle both sk types */ 609 sock->ops = &iucv_sock_ops; 610 break; 611 default: 612 return -ESOCKTNOSUPPORT; 613 } 614 615 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 616 if (!sk) 617 return -ENOMEM; 618 619 iucv_sock_init(sk, NULL); 620 621 return 0; 622 } 623 624 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 625 { 626 write_lock_bh(&l->lock); 627 sk_add_node(sk, &l->head); 628 write_unlock_bh(&l->lock); 629 } 630 631 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 632 { 633 write_lock_bh(&l->lock); 634 sk_del_node_init(sk); 635 write_unlock_bh(&l->lock); 636 } 637 638 void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 639 { 640 unsigned long flags; 641 struct iucv_sock *par = iucv_sk(parent); 642 643 sock_hold(sk); 644 spin_lock_irqsave(&par->accept_q_lock, flags); 645 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 646 spin_unlock_irqrestore(&par->accept_q_lock, flags); 647 iucv_sk(sk)->parent = parent; 648 sk_acceptq_added(parent); 649 } 650 651 void iucv_accept_unlink(struct sock *sk) 652 { 653 unsigned long flags; 654 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 655 656 spin_lock_irqsave(&par->accept_q_lock, flags); 657 list_del_init(&iucv_sk(sk)->accept_q); 658 spin_unlock_irqrestore(&par->accept_q_lock, flags); 659 sk_acceptq_removed(iucv_sk(sk)->parent); 660 iucv_sk(sk)->parent = NULL; 661 sock_put(sk); 662 } 663 664 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 665 { 666 struct iucv_sock *isk, *n; 667 struct sock *sk; 668 669 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 670 sk = (struct sock *) isk; 671 lock_sock(sk); 672 673 if (sk->sk_state == IUCV_CLOSED) { 674 iucv_accept_unlink(sk); 675 release_sock(sk); 676 continue; 677 } 678 679 if (sk->sk_state == IUCV_CONNECTED || 680 sk->sk_state == IUCV_DISCONN || 681 !newsock) { 682 iucv_accept_unlink(sk); 683 if (newsock) 684 sock_graft(sk, newsock); 685 686 release_sock(sk); 687 return sk; 688 } 689 690 release_sock(sk); 691 } 692 return NULL; 693 } 694 695 static void __iucv_auto_name(struct iucv_sock *iucv) 696 { 697 char name[12]; 698 699 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 700 while (__iucv_get_sock_by_name(name)) { 701 sprintf(name, "%08x", 702 atomic_inc_return(&iucv_sk_list.autobind_name)); 703 } 704 memcpy(iucv->src_name, name, 8); 705 } 706 707 /* Bind an unbound socket */ 708 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 709 int addr_len) 710 { 711 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 712 struct sock *sk = sock->sk; 713 struct iucv_sock *iucv; 714 int err = 0; 715 struct net_device *dev; 716 char uid[9]; 717 718 /* Verify the input sockaddr */ 719 if (!addr || addr->sa_family != AF_IUCV) 720 return -EINVAL; 721 722 if (addr_len < sizeof(struct sockaddr_iucv)) 723 return -EINVAL; 724 725 lock_sock(sk); 726 if (sk->sk_state != IUCV_OPEN) { 727 err = -EBADFD; 728 goto done; 729 } 730 731 write_lock_bh(&iucv_sk_list.lock); 732 733 iucv = iucv_sk(sk); 734 if (__iucv_get_sock_by_name(sa->siucv_name)) { 735 err = -EADDRINUSE; 736 goto done_unlock; 737 } 738 if (iucv->path) 739 goto done_unlock; 740 741 /* Bind the socket */ 742 if (pr_iucv) 743 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 744 goto vm_bind; /* VM IUCV transport */ 745 746 /* try hiper transport */ 747 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 748 ASCEBC(uid, 8); 749 rcu_read_lock(); 750 for_each_netdev_rcu(&init_net, dev) { 751 if (!memcmp(dev->perm_addr, uid, 8)) { 752 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 753 /* Check for unitialized siucv_name */ 754 if (strncmp(sa->siucv_name, " ", 8) == 0) 755 __iucv_auto_name(iucv); 756 else 757 memcpy(iucv->src_name, sa->siucv_name, 8); 758 sk->sk_bound_dev_if = dev->ifindex; 759 iucv->hs_dev = dev; 760 dev_hold(dev); 761 sk->sk_state = IUCV_BOUND; 762 iucv->transport = AF_IUCV_TRANS_HIPER; 763 if (!iucv->msglimit) 764 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 765 rcu_read_unlock(); 766 goto done_unlock; 767 } 768 } 769 rcu_read_unlock(); 770 vm_bind: 771 if (pr_iucv) { 772 /* use local userid for backward compat */ 773 memcpy(iucv->src_name, sa->siucv_name, 8); 774 memcpy(iucv->src_user_id, iucv_userid, 8); 775 sk->sk_state = IUCV_BOUND; 776 iucv->transport = AF_IUCV_TRANS_IUCV; 777 if (!iucv->msglimit) 778 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 779 goto done_unlock; 780 } 781 /* found no dev to bind */ 782 err = -ENODEV; 783 done_unlock: 784 /* Release the socket list lock */ 785 write_unlock_bh(&iucv_sk_list.lock); 786 done: 787 release_sock(sk); 788 return err; 789 } 790 791 /* Automatically bind an unbound socket */ 792 static int iucv_sock_autobind(struct sock *sk) 793 { 794 struct iucv_sock *iucv = iucv_sk(sk); 795 int err = 0; 796 797 if (unlikely(!pr_iucv)) 798 return -EPROTO; 799 800 memcpy(iucv->src_user_id, iucv_userid, 8); 801 802 write_lock_bh(&iucv_sk_list.lock); 803 __iucv_auto_name(iucv); 804 write_unlock_bh(&iucv_sk_list.lock); 805 806 if (!iucv->msglimit) 807 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 808 809 return err; 810 } 811 812 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 813 { 814 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 815 struct sock *sk = sock->sk; 816 struct iucv_sock *iucv = iucv_sk(sk); 817 unsigned char user_data[16]; 818 int err; 819 820 high_nmcpy(user_data, sa->siucv_name); 821 low_nmcpy(user_data, iucv->src_name); 822 ASCEBC(user_data, sizeof(user_data)); 823 824 /* Create path. */ 825 iucv->path = iucv_path_alloc(iucv->msglimit, 826 IUCV_IPRMDATA, GFP_KERNEL); 827 if (!iucv->path) { 828 err = -ENOMEM; 829 goto done; 830 } 831 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 832 sa->siucv_user_id, NULL, user_data, 833 sk); 834 if (err) { 835 iucv_path_free(iucv->path); 836 iucv->path = NULL; 837 switch (err) { 838 case 0x0b: /* Target communicator is not logged on */ 839 err = -ENETUNREACH; 840 break; 841 case 0x0d: /* Max connections for this guest exceeded */ 842 case 0x0e: /* Max connections for target guest exceeded */ 843 err = -EAGAIN; 844 break; 845 case 0x0f: /* Missing IUCV authorization */ 846 err = -EACCES; 847 break; 848 default: 849 err = -ECONNREFUSED; 850 break; 851 } 852 } 853 done: 854 return err; 855 } 856 857 /* Connect an unconnected socket */ 858 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 859 int alen, int flags) 860 { 861 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 862 struct sock *sk = sock->sk; 863 struct iucv_sock *iucv = iucv_sk(sk); 864 int err; 865 866 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) 867 return -EINVAL; 868 869 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 870 return -EBADFD; 871 872 if (sk->sk_state == IUCV_OPEN && 873 iucv->transport == AF_IUCV_TRANS_HIPER) 874 return -EBADFD; /* explicit bind required */ 875 876 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 877 return -EINVAL; 878 879 if (sk->sk_state == IUCV_OPEN) { 880 err = iucv_sock_autobind(sk); 881 if (unlikely(err)) 882 return err; 883 } 884 885 lock_sock(sk); 886 887 /* Set the destination information */ 888 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 889 memcpy(iucv->dst_name, sa->siucv_name, 8); 890 891 if (iucv->transport == AF_IUCV_TRANS_HIPER) 892 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 893 else 894 err = afiucv_path_connect(sock, addr); 895 if (err) 896 goto done; 897 898 if (sk->sk_state != IUCV_CONNECTED) 899 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 900 IUCV_DISCONN), 901 sock_sndtimeo(sk, flags & O_NONBLOCK)); 902 903 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 904 err = -ECONNREFUSED; 905 906 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 907 iucv_sever_path(sk, 0); 908 909 done: 910 release_sock(sk); 911 return err; 912 } 913 914 /* Move a socket into listening state. */ 915 static int iucv_sock_listen(struct socket *sock, int backlog) 916 { 917 struct sock *sk = sock->sk; 918 int err; 919 920 lock_sock(sk); 921 922 err = -EINVAL; 923 if (sk->sk_state != IUCV_BOUND) 924 goto done; 925 926 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 927 goto done; 928 929 sk->sk_max_ack_backlog = backlog; 930 sk->sk_ack_backlog = 0; 931 sk->sk_state = IUCV_LISTEN; 932 err = 0; 933 934 done: 935 release_sock(sk); 936 return err; 937 } 938 939 /* Accept a pending connection */ 940 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 941 int flags, bool kern) 942 { 943 DECLARE_WAITQUEUE(wait, current); 944 struct sock *sk = sock->sk, *nsk; 945 long timeo; 946 int err = 0; 947 948 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 949 950 if (sk->sk_state != IUCV_LISTEN) { 951 err = -EBADFD; 952 goto done; 953 } 954 955 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 956 957 /* Wait for an incoming connection */ 958 add_wait_queue_exclusive(sk_sleep(sk), &wait); 959 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 960 set_current_state(TASK_INTERRUPTIBLE); 961 if (!timeo) { 962 err = -EAGAIN; 963 break; 964 } 965 966 release_sock(sk); 967 timeo = schedule_timeout(timeo); 968 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 969 970 if (sk->sk_state != IUCV_LISTEN) { 971 err = -EBADFD; 972 break; 973 } 974 975 if (signal_pending(current)) { 976 err = sock_intr_errno(timeo); 977 break; 978 } 979 } 980 981 set_current_state(TASK_RUNNING); 982 remove_wait_queue(sk_sleep(sk), &wait); 983 984 if (err) 985 goto done; 986 987 newsock->state = SS_CONNECTED; 988 989 done: 990 release_sock(sk); 991 return err; 992 } 993 994 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 995 int *len, int peer) 996 { 997 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 998 struct sock *sk = sock->sk; 999 struct iucv_sock *iucv = iucv_sk(sk); 1000 1001 addr->sa_family = AF_IUCV; 1002 *len = sizeof(struct sockaddr_iucv); 1003 1004 if (peer) { 1005 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 1006 memcpy(siucv->siucv_name, iucv->dst_name, 8); 1007 } else { 1008 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 1009 memcpy(siucv->siucv_name, iucv->src_name, 8); 1010 } 1011 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 1012 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 1013 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 1014 1015 return 0; 1016 } 1017 1018 /** 1019 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 1020 * @path: IUCV path 1021 * @msg: Pointer to a struct iucv_message 1022 * @skb: The socket data to send, skb->len MUST BE <= 7 1023 * 1024 * Send the socket data in the parameter list in the iucv message 1025 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 1026 * list and the socket data len at index 7 (last byte). 1027 * See also iucv_msg_length(). 1028 * 1029 * Returns the error code from the iucv_message_send() call. 1030 */ 1031 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 1032 struct sk_buff *skb) 1033 { 1034 u8 prmdata[8]; 1035 1036 memcpy(prmdata, (void *) skb->data, skb->len); 1037 prmdata[7] = 0xff - (u8) skb->len; 1038 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 1039 (void *) prmdata, 8); 1040 } 1041 1042 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 1043 size_t len) 1044 { 1045 struct sock *sk = sock->sk; 1046 struct iucv_sock *iucv = iucv_sk(sk); 1047 size_t headroom = 0; 1048 size_t linear; 1049 struct sk_buff *skb; 1050 struct iucv_message txmsg = {0}; 1051 struct cmsghdr *cmsg; 1052 int cmsg_done; 1053 long timeo; 1054 char user_id[9]; 1055 char appl_id[9]; 1056 int err; 1057 int noblock = msg->msg_flags & MSG_DONTWAIT; 1058 1059 err = sock_error(sk); 1060 if (err) 1061 return err; 1062 1063 if (msg->msg_flags & MSG_OOB) 1064 return -EOPNOTSUPP; 1065 1066 /* SOCK_SEQPACKET: we do not support segmented records */ 1067 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 1068 return -EOPNOTSUPP; 1069 1070 lock_sock(sk); 1071 1072 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1073 err = -EPIPE; 1074 goto out; 1075 } 1076 1077 /* Return if the socket is not in connected state */ 1078 if (sk->sk_state != IUCV_CONNECTED) { 1079 err = -ENOTCONN; 1080 goto out; 1081 } 1082 1083 /* initialize defaults */ 1084 cmsg_done = 0; /* check for duplicate headers */ 1085 txmsg.class = 0; 1086 1087 /* iterate over control messages */ 1088 for_each_cmsghdr(cmsg, msg) { 1089 if (!CMSG_OK(msg, cmsg)) { 1090 err = -EINVAL; 1091 goto out; 1092 } 1093 1094 if (cmsg->cmsg_level != SOL_IUCV) 1095 continue; 1096 1097 if (cmsg->cmsg_type & cmsg_done) { 1098 err = -EINVAL; 1099 goto out; 1100 } 1101 cmsg_done |= cmsg->cmsg_type; 1102 1103 switch (cmsg->cmsg_type) { 1104 case SCM_IUCV_TRGCLS: 1105 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 1106 err = -EINVAL; 1107 goto out; 1108 } 1109 1110 /* set iucv message target class */ 1111 memcpy(&txmsg.class, 1112 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 1113 1114 break; 1115 1116 default: 1117 err = -EINVAL; 1118 goto out; 1119 } 1120 } 1121 1122 /* allocate one skb for each iucv message: 1123 * this is fine for SOCK_SEQPACKET (unless we want to support 1124 * segmented records using the MSG_EOR flag), but 1125 * for SOCK_STREAM we might want to improve it in future */ 1126 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1127 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 1128 linear = len; 1129 } else { 1130 if (len < PAGE_SIZE) { 1131 linear = len; 1132 } else { 1133 /* In nonlinear "classic" iucv skb, 1134 * reserve space for iucv_array 1135 */ 1136 headroom = sizeof(struct iucv_array) * 1137 (MAX_SKB_FRAGS + 1); 1138 linear = PAGE_SIZE - headroom; 1139 } 1140 } 1141 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, 1142 noblock, &err, 0); 1143 if (!skb) 1144 goto out; 1145 if (headroom) 1146 skb_reserve(skb, headroom); 1147 skb_put(skb, linear); 1148 skb->len = len; 1149 skb->data_len = len - linear; 1150 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); 1151 if (err) 1152 goto fail; 1153 1154 /* wait if outstanding messages for iucv path has reached */ 1155 timeo = sock_sndtimeo(sk, noblock); 1156 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1157 if (err) 1158 goto fail; 1159 1160 /* return -ECONNRESET if the socket is no longer connected */ 1161 if (sk->sk_state != IUCV_CONNECTED) { 1162 err = -ECONNRESET; 1163 goto fail; 1164 } 1165 1166 /* increment and save iucv message tag for msg_completion cbk */ 1167 txmsg.tag = iucv->send_tag++; 1168 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1169 1170 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1171 atomic_inc(&iucv->msg_sent); 1172 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1173 if (err) { 1174 atomic_dec(&iucv->msg_sent); 1175 goto fail; 1176 } 1177 } else { /* Classic VM IUCV transport */ 1178 skb_queue_tail(&iucv->send_skb_q, skb); 1179 1180 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && 1181 skb->len <= 7) { 1182 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1183 1184 /* on success: there is no message_complete callback */ 1185 /* for an IPRMDATA msg; remove skb from send queue */ 1186 if (err == 0) { 1187 skb_unlink(skb, &iucv->send_skb_q); 1188 kfree_skb(skb); 1189 } 1190 1191 /* this error should never happen since the */ 1192 /* IUCV_IPRMDATA path flag is set... sever path */ 1193 if (err == 0x15) { 1194 pr_iucv->path_sever(iucv->path, NULL); 1195 skb_unlink(skb, &iucv->send_skb_q); 1196 err = -EPIPE; 1197 goto fail; 1198 } 1199 } else if (skb_is_nonlinear(skb)) { 1200 struct iucv_array *iba = (struct iucv_array *)skb->head; 1201 int i; 1202 1203 /* skip iucv_array lying in the headroom */ 1204 iba[0].address = (u32)(addr_t)skb->data; 1205 iba[0].length = (u32)skb_headlen(skb); 1206 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1207 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1208 1209 iba[i + 1].address = 1210 (u32)(addr_t)skb_frag_address(frag); 1211 iba[i + 1].length = (u32)skb_frag_size(frag); 1212 } 1213 err = pr_iucv->message_send(iucv->path, &txmsg, 1214 IUCV_IPBUFLST, 0, 1215 (void *)iba, skb->len); 1216 } else { /* non-IPRM Linear skb */ 1217 err = pr_iucv->message_send(iucv->path, &txmsg, 1218 0, 0, (void *)skb->data, skb->len); 1219 } 1220 if (err) { 1221 if (err == 3) { 1222 user_id[8] = 0; 1223 memcpy(user_id, iucv->dst_user_id, 8); 1224 appl_id[8] = 0; 1225 memcpy(appl_id, iucv->dst_name, 8); 1226 pr_err( 1227 "Application %s on z/VM guest %s exceeds message limit\n", 1228 appl_id, user_id); 1229 err = -EAGAIN; 1230 } else { 1231 err = -EPIPE; 1232 } 1233 skb_unlink(skb, &iucv->send_skb_q); 1234 goto fail; 1235 } 1236 } 1237 1238 release_sock(sk); 1239 return len; 1240 1241 fail: 1242 kfree_skb(skb); 1243 out: 1244 release_sock(sk); 1245 return err; 1246 } 1247 1248 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) 1249 { 1250 size_t headroom, linear; 1251 struct sk_buff *skb; 1252 int err; 1253 1254 if (len < PAGE_SIZE) { 1255 headroom = 0; 1256 linear = len; 1257 } else { 1258 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); 1259 linear = PAGE_SIZE - headroom; 1260 } 1261 skb = alloc_skb_with_frags(headroom + linear, len - linear, 1262 0, &err, GFP_ATOMIC | GFP_DMA); 1263 WARN_ONCE(!skb, 1264 "alloc of recv iucv skb len=%lu failed with errcode=%d\n", 1265 len, err); 1266 if (skb) { 1267 if (headroom) 1268 skb_reserve(skb, headroom); 1269 skb_put(skb, linear); 1270 skb->len = len; 1271 skb->data_len = len - linear; 1272 } 1273 return skb; 1274 } 1275 1276 /* iucv_process_message() - Receive a single outstanding IUCV message 1277 * 1278 * Locking: must be called with message_q.lock held 1279 */ 1280 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1281 struct iucv_path *path, 1282 struct iucv_message *msg) 1283 { 1284 int rc; 1285 unsigned int len; 1286 1287 len = iucv_msg_length(msg); 1288 1289 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1290 /* Note: the first 4 bytes are reserved for msg tag */ 1291 IUCV_SKB_CB(skb)->class = msg->class; 1292 1293 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1294 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1295 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1296 skb->data = NULL; 1297 skb->len = 0; 1298 } 1299 } else { 1300 if (skb_is_nonlinear(skb)) { 1301 struct iucv_array *iba = (struct iucv_array *)skb->head; 1302 int i; 1303 1304 iba[0].address = (u32)(addr_t)skb->data; 1305 iba[0].length = (u32)skb_headlen(skb); 1306 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1307 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1308 1309 iba[i + 1].address = 1310 (u32)(addr_t)skb_frag_address(frag); 1311 iba[i + 1].length = (u32)skb_frag_size(frag); 1312 } 1313 rc = pr_iucv->message_receive(path, msg, 1314 IUCV_IPBUFLST, 1315 (void *)iba, len, NULL); 1316 } else { 1317 rc = pr_iucv->message_receive(path, msg, 1318 msg->flags & IUCV_IPRMDATA, 1319 skb->data, len, NULL); 1320 } 1321 if (rc) { 1322 kfree_skb(skb); 1323 return; 1324 } 1325 WARN_ON_ONCE(skb->len != len); 1326 } 1327 1328 IUCV_SKB_CB(skb)->offset = 0; 1329 if (sk_filter(sk, skb)) { 1330 atomic_inc(&sk->sk_drops); /* skb rejected by filter */ 1331 kfree_skb(skb); 1332 return; 1333 } 1334 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ 1335 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 1336 } 1337 1338 /* iucv_process_message_q() - Process outstanding IUCV messages 1339 * 1340 * Locking: must be called with message_q.lock held 1341 */ 1342 static void iucv_process_message_q(struct sock *sk) 1343 { 1344 struct iucv_sock *iucv = iucv_sk(sk); 1345 struct sk_buff *skb; 1346 struct sock_msg_q *p, *n; 1347 1348 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1349 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); 1350 if (!skb) 1351 break; 1352 iucv_process_message(sk, skb, p->path, &p->msg); 1353 list_del(&p->list); 1354 kfree(p); 1355 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1356 break; 1357 } 1358 } 1359 1360 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1361 size_t len, int flags) 1362 { 1363 int noblock = flags & MSG_DONTWAIT; 1364 struct sock *sk = sock->sk; 1365 struct iucv_sock *iucv = iucv_sk(sk); 1366 unsigned int copied, rlen; 1367 struct sk_buff *skb, *rskb, *cskb; 1368 int err = 0; 1369 u32 offset; 1370 1371 if ((sk->sk_state == IUCV_DISCONN) && 1372 skb_queue_empty(&iucv->backlog_skb_q) && 1373 skb_queue_empty(&sk->sk_receive_queue) && 1374 list_empty(&iucv->message_q.list)) 1375 return 0; 1376 1377 if (flags & (MSG_OOB)) 1378 return -EOPNOTSUPP; 1379 1380 /* receive/dequeue next skb: 1381 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1382 skb = skb_recv_datagram(sk, flags, noblock, &err); 1383 if (!skb) { 1384 if (sk->sk_shutdown & RCV_SHUTDOWN) 1385 return 0; 1386 return err; 1387 } 1388 1389 offset = IUCV_SKB_CB(skb)->offset; 1390 rlen = skb->len - offset; /* real length of skb */ 1391 copied = min_t(unsigned int, rlen, len); 1392 if (!rlen) 1393 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1394 1395 cskb = skb; 1396 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1397 if (!(flags & MSG_PEEK)) 1398 skb_queue_head(&sk->sk_receive_queue, skb); 1399 return -EFAULT; 1400 } 1401 1402 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1403 if (sk->sk_type == SOCK_SEQPACKET) { 1404 if (copied < rlen) 1405 msg->msg_flags |= MSG_TRUNC; 1406 /* each iucv message contains a complete record */ 1407 msg->msg_flags |= MSG_EOR; 1408 } 1409 1410 /* create control message to store iucv msg target class: 1411 * get the trgcls from the control buffer of the skb due to 1412 * fragmentation of original iucv message. */ 1413 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1414 sizeof(IUCV_SKB_CB(skb)->class), 1415 (void *)&IUCV_SKB_CB(skb)->class); 1416 if (err) { 1417 if (!(flags & MSG_PEEK)) 1418 skb_queue_head(&sk->sk_receive_queue, skb); 1419 return err; 1420 } 1421 1422 /* Mark read part of skb as used */ 1423 if (!(flags & MSG_PEEK)) { 1424 1425 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1426 if (sk->sk_type == SOCK_STREAM) { 1427 if (copied < rlen) { 1428 IUCV_SKB_CB(skb)->offset = offset + copied; 1429 skb_queue_head(&sk->sk_receive_queue, skb); 1430 goto done; 1431 } 1432 } 1433 1434 kfree_skb(skb); 1435 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1436 atomic_inc(&iucv->msg_recv); 1437 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1438 WARN_ON(1); 1439 iucv_sock_close(sk); 1440 return -EFAULT; 1441 } 1442 } 1443 1444 /* Queue backlog skbs */ 1445 spin_lock_bh(&iucv->message_q.lock); 1446 rskb = skb_dequeue(&iucv->backlog_skb_q); 1447 while (rskb) { 1448 IUCV_SKB_CB(rskb)->offset = 0; 1449 if (__sock_queue_rcv_skb(sk, rskb)) { 1450 /* handle rcv queue full */ 1451 skb_queue_head(&iucv->backlog_skb_q, 1452 rskb); 1453 break; 1454 } 1455 rskb = skb_dequeue(&iucv->backlog_skb_q); 1456 } 1457 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1458 if (!list_empty(&iucv->message_q.list)) 1459 iucv_process_message_q(sk); 1460 if (atomic_read(&iucv->msg_recv) >= 1461 iucv->msglimit / 2) { 1462 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1463 if (err) { 1464 sk->sk_state = IUCV_DISCONN; 1465 sk->sk_state_change(sk); 1466 } 1467 } 1468 } 1469 spin_unlock_bh(&iucv->message_q.lock); 1470 } 1471 1472 done: 1473 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1474 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1475 copied = rlen; 1476 1477 return copied; 1478 } 1479 1480 static inline unsigned int iucv_accept_poll(struct sock *parent) 1481 { 1482 struct iucv_sock *isk, *n; 1483 struct sock *sk; 1484 1485 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1486 sk = (struct sock *) isk; 1487 1488 if (sk->sk_state == IUCV_CONNECTED) 1489 return POLLIN | POLLRDNORM; 1490 } 1491 1492 return 0; 1493 } 1494 1495 unsigned int iucv_sock_poll(struct file *file, struct socket *sock, 1496 poll_table *wait) 1497 { 1498 struct sock *sk = sock->sk; 1499 unsigned int mask = 0; 1500 1501 sock_poll_wait(file, sk_sleep(sk), wait); 1502 1503 if (sk->sk_state == IUCV_LISTEN) 1504 return iucv_accept_poll(sk); 1505 1506 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1507 mask |= POLLERR | 1508 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); 1509 1510 if (sk->sk_shutdown & RCV_SHUTDOWN) 1511 mask |= POLLRDHUP; 1512 1513 if (sk->sk_shutdown == SHUTDOWN_MASK) 1514 mask |= POLLHUP; 1515 1516 if (!skb_queue_empty(&sk->sk_receive_queue) || 1517 (sk->sk_shutdown & RCV_SHUTDOWN)) 1518 mask |= POLLIN | POLLRDNORM; 1519 1520 if (sk->sk_state == IUCV_CLOSED) 1521 mask |= POLLHUP; 1522 1523 if (sk->sk_state == IUCV_DISCONN) 1524 mask |= POLLIN; 1525 1526 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1527 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 1528 else 1529 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1530 1531 return mask; 1532 } 1533 1534 static int iucv_sock_shutdown(struct socket *sock, int how) 1535 { 1536 struct sock *sk = sock->sk; 1537 struct iucv_sock *iucv = iucv_sk(sk); 1538 struct iucv_message txmsg; 1539 int err = 0; 1540 1541 how++; 1542 1543 if ((how & ~SHUTDOWN_MASK) || !how) 1544 return -EINVAL; 1545 1546 lock_sock(sk); 1547 switch (sk->sk_state) { 1548 case IUCV_LISTEN: 1549 case IUCV_DISCONN: 1550 case IUCV_CLOSING: 1551 case IUCV_CLOSED: 1552 err = -ENOTCONN; 1553 goto fail; 1554 default: 1555 break; 1556 } 1557 1558 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1559 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1560 txmsg.class = 0; 1561 txmsg.tag = 0; 1562 err = pr_iucv->message_send(iucv->path, &txmsg, 1563 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1564 if (err) { 1565 switch (err) { 1566 case 1: 1567 err = -ENOTCONN; 1568 break; 1569 case 2: 1570 err = -ECONNRESET; 1571 break; 1572 default: 1573 err = -ENOTCONN; 1574 break; 1575 } 1576 } 1577 } else 1578 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1579 } 1580 1581 sk->sk_shutdown |= how; 1582 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1583 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1584 iucv->path) { 1585 err = pr_iucv->path_quiesce(iucv->path, NULL); 1586 if (err) 1587 err = -ENOTCONN; 1588 /* skb_queue_purge(&sk->sk_receive_queue); */ 1589 } 1590 skb_queue_purge(&sk->sk_receive_queue); 1591 } 1592 1593 /* Wake up anyone sleeping in poll */ 1594 sk->sk_state_change(sk); 1595 1596 fail: 1597 release_sock(sk); 1598 return err; 1599 } 1600 1601 static int iucv_sock_release(struct socket *sock) 1602 { 1603 struct sock *sk = sock->sk; 1604 int err = 0; 1605 1606 if (!sk) 1607 return 0; 1608 1609 iucv_sock_close(sk); 1610 1611 sock_orphan(sk); 1612 iucv_sock_kill(sk); 1613 return err; 1614 } 1615 1616 /* getsockopt and setsockopt */ 1617 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1618 char __user *optval, unsigned int optlen) 1619 { 1620 struct sock *sk = sock->sk; 1621 struct iucv_sock *iucv = iucv_sk(sk); 1622 int val; 1623 int rc; 1624 1625 if (level != SOL_IUCV) 1626 return -ENOPROTOOPT; 1627 1628 if (optlen < sizeof(int)) 1629 return -EINVAL; 1630 1631 if (get_user(val, (int __user *) optval)) 1632 return -EFAULT; 1633 1634 rc = 0; 1635 1636 lock_sock(sk); 1637 switch (optname) { 1638 case SO_IPRMDATA_MSG: 1639 if (val) 1640 iucv->flags |= IUCV_IPRMDATA; 1641 else 1642 iucv->flags &= ~IUCV_IPRMDATA; 1643 break; 1644 case SO_MSGLIMIT: 1645 switch (sk->sk_state) { 1646 case IUCV_OPEN: 1647 case IUCV_BOUND: 1648 if (val < 1 || val > (u16)(~0)) 1649 rc = -EINVAL; 1650 else 1651 iucv->msglimit = val; 1652 break; 1653 default: 1654 rc = -EINVAL; 1655 break; 1656 } 1657 break; 1658 default: 1659 rc = -ENOPROTOOPT; 1660 break; 1661 } 1662 release_sock(sk); 1663 1664 return rc; 1665 } 1666 1667 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1668 char __user *optval, int __user *optlen) 1669 { 1670 struct sock *sk = sock->sk; 1671 struct iucv_sock *iucv = iucv_sk(sk); 1672 unsigned int val; 1673 int len; 1674 1675 if (level != SOL_IUCV) 1676 return -ENOPROTOOPT; 1677 1678 if (get_user(len, optlen)) 1679 return -EFAULT; 1680 1681 if (len < 0) 1682 return -EINVAL; 1683 1684 len = min_t(unsigned int, len, sizeof(int)); 1685 1686 switch (optname) { 1687 case SO_IPRMDATA_MSG: 1688 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1689 break; 1690 case SO_MSGLIMIT: 1691 lock_sock(sk); 1692 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1693 : iucv->msglimit; /* default */ 1694 release_sock(sk); 1695 break; 1696 case SO_MSGSIZE: 1697 if (sk->sk_state == IUCV_OPEN) 1698 return -EBADFD; 1699 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1700 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1701 0x7fffffff; 1702 break; 1703 default: 1704 return -ENOPROTOOPT; 1705 } 1706 1707 if (put_user(len, optlen)) 1708 return -EFAULT; 1709 if (copy_to_user(optval, &val, len)) 1710 return -EFAULT; 1711 1712 return 0; 1713 } 1714 1715 1716 /* Callback wrappers - called from iucv base support */ 1717 static int iucv_callback_connreq(struct iucv_path *path, 1718 u8 ipvmid[8], u8 ipuser[16]) 1719 { 1720 unsigned char user_data[16]; 1721 unsigned char nuser_data[16]; 1722 unsigned char src_name[8]; 1723 struct sock *sk, *nsk; 1724 struct iucv_sock *iucv, *niucv; 1725 int err; 1726 1727 memcpy(src_name, ipuser, 8); 1728 EBCASC(src_name, 8); 1729 /* Find out if this path belongs to af_iucv. */ 1730 read_lock(&iucv_sk_list.lock); 1731 iucv = NULL; 1732 sk = NULL; 1733 sk_for_each(sk, &iucv_sk_list.head) 1734 if (sk->sk_state == IUCV_LISTEN && 1735 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1736 /* 1737 * Found a listening socket with 1738 * src_name == ipuser[0-7]. 1739 */ 1740 iucv = iucv_sk(sk); 1741 break; 1742 } 1743 read_unlock(&iucv_sk_list.lock); 1744 if (!iucv) 1745 /* No socket found, not one of our paths. */ 1746 return -EINVAL; 1747 1748 bh_lock_sock(sk); 1749 1750 /* Check if parent socket is listening */ 1751 low_nmcpy(user_data, iucv->src_name); 1752 high_nmcpy(user_data, iucv->dst_name); 1753 ASCEBC(user_data, sizeof(user_data)); 1754 if (sk->sk_state != IUCV_LISTEN) { 1755 err = pr_iucv->path_sever(path, user_data); 1756 iucv_path_free(path); 1757 goto fail; 1758 } 1759 1760 /* Check for backlog size */ 1761 if (sk_acceptq_is_full(sk)) { 1762 err = pr_iucv->path_sever(path, user_data); 1763 iucv_path_free(path); 1764 goto fail; 1765 } 1766 1767 /* Create the new socket */ 1768 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1769 if (!nsk) { 1770 err = pr_iucv->path_sever(path, user_data); 1771 iucv_path_free(path); 1772 goto fail; 1773 } 1774 1775 niucv = iucv_sk(nsk); 1776 iucv_sock_init(nsk, sk); 1777 1778 /* Set the new iucv_sock */ 1779 memcpy(niucv->dst_name, ipuser + 8, 8); 1780 EBCASC(niucv->dst_name, 8); 1781 memcpy(niucv->dst_user_id, ipvmid, 8); 1782 memcpy(niucv->src_name, iucv->src_name, 8); 1783 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1784 niucv->path = path; 1785 1786 /* Call iucv_accept */ 1787 high_nmcpy(nuser_data, ipuser + 8); 1788 memcpy(nuser_data + 8, niucv->src_name, 8); 1789 ASCEBC(nuser_data + 8, 8); 1790 1791 /* set message limit for path based on msglimit of accepting socket */ 1792 niucv->msglimit = iucv->msglimit; 1793 path->msglim = iucv->msglimit; 1794 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1795 if (err) { 1796 iucv_sever_path(nsk, 1); 1797 iucv_sock_kill(nsk); 1798 goto fail; 1799 } 1800 1801 iucv_accept_enqueue(sk, nsk); 1802 1803 /* Wake up accept */ 1804 nsk->sk_state = IUCV_CONNECTED; 1805 sk->sk_data_ready(sk); 1806 err = 0; 1807 fail: 1808 bh_unlock_sock(sk); 1809 return 0; 1810 } 1811 1812 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1813 { 1814 struct sock *sk = path->private; 1815 1816 sk->sk_state = IUCV_CONNECTED; 1817 sk->sk_state_change(sk); 1818 } 1819 1820 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1821 { 1822 struct sock *sk = path->private; 1823 struct iucv_sock *iucv = iucv_sk(sk); 1824 struct sk_buff *skb; 1825 struct sock_msg_q *save_msg; 1826 int len; 1827 1828 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1829 pr_iucv->message_reject(path, msg); 1830 return; 1831 } 1832 1833 spin_lock(&iucv->message_q.lock); 1834 1835 if (!list_empty(&iucv->message_q.list) || 1836 !skb_queue_empty(&iucv->backlog_skb_q)) 1837 goto save_message; 1838 1839 len = atomic_read(&sk->sk_rmem_alloc); 1840 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1841 if (len > sk->sk_rcvbuf) 1842 goto save_message; 1843 1844 skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); 1845 if (!skb) 1846 goto save_message; 1847 1848 iucv_process_message(sk, skb, path, msg); 1849 goto out_unlock; 1850 1851 save_message: 1852 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1853 if (!save_msg) 1854 goto out_unlock; 1855 save_msg->path = path; 1856 save_msg->msg = *msg; 1857 1858 list_add_tail(&save_msg->list, &iucv->message_q.list); 1859 1860 out_unlock: 1861 spin_unlock(&iucv->message_q.lock); 1862 } 1863 1864 static void iucv_callback_txdone(struct iucv_path *path, 1865 struct iucv_message *msg) 1866 { 1867 struct sock *sk = path->private; 1868 struct sk_buff *this = NULL; 1869 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1870 struct sk_buff *list_skb = list->next; 1871 unsigned long flags; 1872 1873 bh_lock_sock(sk); 1874 if (!skb_queue_empty(list)) { 1875 spin_lock_irqsave(&list->lock, flags); 1876 1877 while (list_skb != (struct sk_buff *)list) { 1878 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1879 this = list_skb; 1880 break; 1881 } 1882 list_skb = list_skb->next; 1883 } 1884 if (this) 1885 __skb_unlink(this, list); 1886 1887 spin_unlock_irqrestore(&list->lock, flags); 1888 1889 if (this) { 1890 kfree_skb(this); 1891 /* wake up any process waiting for sending */ 1892 iucv_sock_wake_msglim(sk); 1893 } 1894 } 1895 1896 if (sk->sk_state == IUCV_CLOSING) { 1897 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1898 sk->sk_state = IUCV_CLOSED; 1899 sk->sk_state_change(sk); 1900 } 1901 } 1902 bh_unlock_sock(sk); 1903 1904 } 1905 1906 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1907 { 1908 struct sock *sk = path->private; 1909 1910 if (sk->sk_state == IUCV_CLOSED) 1911 return; 1912 1913 bh_lock_sock(sk); 1914 iucv_sever_path(sk, 1); 1915 sk->sk_state = IUCV_DISCONN; 1916 1917 sk->sk_state_change(sk); 1918 bh_unlock_sock(sk); 1919 } 1920 1921 /* called if the other communication side shuts down its RECV direction; 1922 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1923 */ 1924 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1925 { 1926 struct sock *sk = path->private; 1927 1928 bh_lock_sock(sk); 1929 if (sk->sk_state != IUCV_CLOSED) { 1930 sk->sk_shutdown |= SEND_SHUTDOWN; 1931 sk->sk_state_change(sk); 1932 } 1933 bh_unlock_sock(sk); 1934 } 1935 1936 /***************** HiperSockets transport callbacks ********************/ 1937 static void afiucv_swap_src_dest(struct sk_buff *skb) 1938 { 1939 struct af_iucv_trans_hdr *trans_hdr = 1940 (struct af_iucv_trans_hdr *)skb->data; 1941 char tmpID[8]; 1942 char tmpName[8]; 1943 1944 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1945 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1946 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1947 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1948 memcpy(tmpID, trans_hdr->srcUserID, 8); 1949 memcpy(tmpName, trans_hdr->srcAppName, 8); 1950 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1951 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1952 memcpy(trans_hdr->destUserID, tmpID, 8); 1953 memcpy(trans_hdr->destAppName, tmpName, 8); 1954 skb_push(skb, ETH_HLEN); 1955 memset(skb->data, 0, ETH_HLEN); 1956 } 1957 1958 /** 1959 * afiucv_hs_callback_syn - react on received SYN 1960 **/ 1961 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1962 { 1963 struct sock *nsk; 1964 struct iucv_sock *iucv, *niucv; 1965 struct af_iucv_trans_hdr *trans_hdr; 1966 int err; 1967 1968 iucv = iucv_sk(sk); 1969 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 1970 if (!iucv) { 1971 /* no sock - connection refused */ 1972 afiucv_swap_src_dest(skb); 1973 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1974 err = dev_queue_xmit(skb); 1975 goto out; 1976 } 1977 1978 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1979 bh_lock_sock(sk); 1980 if ((sk->sk_state != IUCV_LISTEN) || 1981 sk_acceptq_is_full(sk) || 1982 !nsk) { 1983 /* error on server socket - connection refused */ 1984 afiucv_swap_src_dest(skb); 1985 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1986 err = dev_queue_xmit(skb); 1987 iucv_sock_kill(nsk); 1988 bh_unlock_sock(sk); 1989 goto out; 1990 } 1991 1992 niucv = iucv_sk(nsk); 1993 iucv_sock_init(nsk, sk); 1994 niucv->transport = AF_IUCV_TRANS_HIPER; 1995 niucv->msglimit = iucv->msglimit; 1996 if (!trans_hdr->window) 1997 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1998 else 1999 niucv->msglimit_peer = trans_hdr->window; 2000 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 2001 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 2002 memcpy(niucv->src_name, iucv->src_name, 8); 2003 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 2004 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 2005 niucv->hs_dev = iucv->hs_dev; 2006 dev_hold(niucv->hs_dev); 2007 afiucv_swap_src_dest(skb); 2008 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 2009 trans_hdr->window = niucv->msglimit; 2010 /* if receiver acks the xmit connection is established */ 2011 err = dev_queue_xmit(skb); 2012 if (!err) { 2013 iucv_accept_enqueue(sk, nsk); 2014 nsk->sk_state = IUCV_CONNECTED; 2015 sk->sk_data_ready(sk); 2016 } else 2017 iucv_sock_kill(nsk); 2018 bh_unlock_sock(sk); 2019 2020 out: 2021 return NET_RX_SUCCESS; 2022 } 2023 2024 /** 2025 * afiucv_hs_callback_synack() - react on received SYN-ACK 2026 **/ 2027 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 2028 { 2029 struct iucv_sock *iucv = iucv_sk(sk); 2030 struct af_iucv_trans_hdr *trans_hdr = 2031 (struct af_iucv_trans_hdr *)skb->data; 2032 2033 if (!iucv) 2034 goto out; 2035 if (sk->sk_state != IUCV_BOUND) 2036 goto out; 2037 bh_lock_sock(sk); 2038 iucv->msglimit_peer = trans_hdr->window; 2039 sk->sk_state = IUCV_CONNECTED; 2040 sk->sk_state_change(sk); 2041 bh_unlock_sock(sk); 2042 out: 2043 kfree_skb(skb); 2044 return NET_RX_SUCCESS; 2045 } 2046 2047 /** 2048 * afiucv_hs_callback_synfin() - react on received SYN_FIN 2049 **/ 2050 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 2051 { 2052 struct iucv_sock *iucv = iucv_sk(sk); 2053 2054 if (!iucv) 2055 goto out; 2056 if (sk->sk_state != IUCV_BOUND) 2057 goto out; 2058 bh_lock_sock(sk); 2059 sk->sk_state = IUCV_DISCONN; 2060 sk->sk_state_change(sk); 2061 bh_unlock_sock(sk); 2062 out: 2063 kfree_skb(skb); 2064 return NET_RX_SUCCESS; 2065 } 2066 2067 /** 2068 * afiucv_hs_callback_fin() - react on received FIN 2069 **/ 2070 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 2071 { 2072 struct iucv_sock *iucv = iucv_sk(sk); 2073 2074 /* other end of connection closed */ 2075 if (!iucv) 2076 goto out; 2077 bh_lock_sock(sk); 2078 if (sk->sk_state == IUCV_CONNECTED) { 2079 sk->sk_state = IUCV_DISCONN; 2080 sk->sk_state_change(sk); 2081 } 2082 bh_unlock_sock(sk); 2083 out: 2084 kfree_skb(skb); 2085 return NET_RX_SUCCESS; 2086 } 2087 2088 /** 2089 * afiucv_hs_callback_win() - react on received WIN 2090 **/ 2091 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2092 { 2093 struct iucv_sock *iucv = iucv_sk(sk); 2094 struct af_iucv_trans_hdr *trans_hdr = 2095 (struct af_iucv_trans_hdr *)skb->data; 2096 2097 if (!iucv) 2098 return NET_RX_SUCCESS; 2099 2100 if (sk->sk_state != IUCV_CONNECTED) 2101 return NET_RX_SUCCESS; 2102 2103 atomic_sub(trans_hdr->window, &iucv->msg_sent); 2104 iucv_sock_wake_msglim(sk); 2105 return NET_RX_SUCCESS; 2106 } 2107 2108 /** 2109 * afiucv_hs_callback_rx() - react on received data 2110 **/ 2111 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2112 { 2113 struct iucv_sock *iucv = iucv_sk(sk); 2114 2115 if (!iucv) { 2116 kfree_skb(skb); 2117 return NET_RX_SUCCESS; 2118 } 2119 2120 if (sk->sk_state != IUCV_CONNECTED) { 2121 kfree_skb(skb); 2122 return NET_RX_SUCCESS; 2123 } 2124 2125 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2126 kfree_skb(skb); 2127 return NET_RX_SUCCESS; 2128 } 2129 2130 /* write stuff from iucv_msg to skb cb */ 2131 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2132 skb_reset_transport_header(skb); 2133 skb_reset_network_header(skb); 2134 IUCV_SKB_CB(skb)->offset = 0; 2135 if (sk_filter(sk, skb)) { 2136 atomic_inc(&sk->sk_drops); /* skb rejected by filter */ 2137 kfree_skb(skb); 2138 return NET_RX_SUCCESS; 2139 } 2140 2141 spin_lock(&iucv->message_q.lock); 2142 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2143 if (__sock_queue_rcv_skb(sk, skb)) 2144 /* handle rcv queue full */ 2145 skb_queue_tail(&iucv->backlog_skb_q, skb); 2146 } else 2147 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2148 spin_unlock(&iucv->message_q.lock); 2149 return NET_RX_SUCCESS; 2150 } 2151 2152 /** 2153 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2154 * transport 2155 * called from netif RX softirq 2156 **/ 2157 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2158 struct packet_type *pt, struct net_device *orig_dev) 2159 { 2160 struct sock *sk; 2161 struct iucv_sock *iucv; 2162 struct af_iucv_trans_hdr *trans_hdr; 2163 char nullstring[8]; 2164 int err = 0; 2165 2166 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) { 2167 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d", 2168 (int)skb->len, 2169 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr))); 2170 kfree_skb(skb); 2171 return NET_RX_SUCCESS; 2172 } 2173 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) 2174 if (skb_linearize(skb)) { 2175 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d", 2176 (int)skb->len); 2177 kfree_skb(skb); 2178 return NET_RX_SUCCESS; 2179 } 2180 skb_pull(skb, ETH_HLEN); 2181 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 2182 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2183 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2184 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2185 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2186 memset(nullstring, 0, sizeof(nullstring)); 2187 iucv = NULL; 2188 sk = NULL; 2189 read_lock(&iucv_sk_list.lock); 2190 sk_for_each(sk, &iucv_sk_list.head) { 2191 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2192 if ((!memcmp(&iucv_sk(sk)->src_name, 2193 trans_hdr->destAppName, 8)) && 2194 (!memcmp(&iucv_sk(sk)->src_user_id, 2195 trans_hdr->destUserID, 8)) && 2196 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2197 (!memcmp(&iucv_sk(sk)->dst_user_id, 2198 nullstring, 8))) { 2199 iucv = iucv_sk(sk); 2200 break; 2201 } 2202 } else { 2203 if ((!memcmp(&iucv_sk(sk)->src_name, 2204 trans_hdr->destAppName, 8)) && 2205 (!memcmp(&iucv_sk(sk)->src_user_id, 2206 trans_hdr->destUserID, 8)) && 2207 (!memcmp(&iucv_sk(sk)->dst_name, 2208 trans_hdr->srcAppName, 8)) && 2209 (!memcmp(&iucv_sk(sk)->dst_user_id, 2210 trans_hdr->srcUserID, 8))) { 2211 iucv = iucv_sk(sk); 2212 break; 2213 } 2214 } 2215 } 2216 read_unlock(&iucv_sk_list.lock); 2217 if (!iucv) 2218 sk = NULL; 2219 2220 /* no sock 2221 how should we send with no sock 2222 1) send without sock no send rc checking? 2223 2) introduce default sock to handle this cases 2224 2225 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2226 data -> send FIN 2227 SYN|ACK, SYN|FIN, FIN -> no action? */ 2228 2229 switch (trans_hdr->flags) { 2230 case AF_IUCV_FLAG_SYN: 2231 /* connect request */ 2232 err = afiucv_hs_callback_syn(sk, skb); 2233 break; 2234 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2235 /* connect request confirmed */ 2236 err = afiucv_hs_callback_synack(sk, skb); 2237 break; 2238 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2239 /* connect request refused */ 2240 err = afiucv_hs_callback_synfin(sk, skb); 2241 break; 2242 case (AF_IUCV_FLAG_FIN): 2243 /* close request */ 2244 err = afiucv_hs_callback_fin(sk, skb); 2245 break; 2246 case (AF_IUCV_FLAG_WIN): 2247 err = afiucv_hs_callback_win(sk, skb); 2248 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2249 kfree_skb(skb); 2250 break; 2251 } 2252 /* fall through and receive non-zero length data */ 2253 case (AF_IUCV_FLAG_SHT): 2254 /* shutdown request */ 2255 /* fall through and receive zero length data */ 2256 case 0: 2257 /* plain data frame */ 2258 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2259 err = afiucv_hs_callback_rx(sk, skb); 2260 break; 2261 default: 2262 ; 2263 } 2264 2265 return err; 2266 } 2267 2268 /** 2269 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2270 * transport 2271 **/ 2272 static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2273 enum iucv_tx_notify n) 2274 { 2275 struct sock *isk = skb->sk; 2276 struct sock *sk = NULL; 2277 struct iucv_sock *iucv = NULL; 2278 struct sk_buff_head *list; 2279 struct sk_buff *list_skb; 2280 struct sk_buff *nskb; 2281 unsigned long flags; 2282 2283 read_lock_irqsave(&iucv_sk_list.lock, flags); 2284 sk_for_each(sk, &iucv_sk_list.head) 2285 if (sk == isk) { 2286 iucv = iucv_sk(sk); 2287 break; 2288 } 2289 read_unlock_irqrestore(&iucv_sk_list.lock, flags); 2290 2291 if (!iucv || sock_flag(sk, SOCK_ZAPPED)) 2292 return; 2293 2294 list = &iucv->send_skb_q; 2295 spin_lock_irqsave(&list->lock, flags); 2296 if (skb_queue_empty(list)) 2297 goto out_unlock; 2298 list_skb = list->next; 2299 nskb = list_skb->next; 2300 while (list_skb != (struct sk_buff *)list) { 2301 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2302 switch (n) { 2303 case TX_NOTIFY_OK: 2304 __skb_unlink(list_skb, list); 2305 kfree_skb(list_skb); 2306 iucv_sock_wake_msglim(sk); 2307 break; 2308 case TX_NOTIFY_PENDING: 2309 atomic_inc(&iucv->pendings); 2310 break; 2311 case TX_NOTIFY_DELAYED_OK: 2312 __skb_unlink(list_skb, list); 2313 atomic_dec(&iucv->pendings); 2314 if (atomic_read(&iucv->pendings) <= 0) 2315 iucv_sock_wake_msglim(sk); 2316 kfree_skb(list_skb); 2317 break; 2318 case TX_NOTIFY_UNREACHABLE: 2319 case TX_NOTIFY_DELAYED_UNREACHABLE: 2320 case TX_NOTIFY_TPQFULL: /* not yet used */ 2321 case TX_NOTIFY_GENERALERROR: 2322 case TX_NOTIFY_DELAYED_GENERALERROR: 2323 __skb_unlink(list_skb, list); 2324 kfree_skb(list_skb); 2325 if (sk->sk_state == IUCV_CONNECTED) { 2326 sk->sk_state = IUCV_DISCONN; 2327 sk->sk_state_change(sk); 2328 } 2329 break; 2330 } 2331 break; 2332 } 2333 list_skb = nskb; 2334 nskb = nskb->next; 2335 } 2336 out_unlock: 2337 spin_unlock_irqrestore(&list->lock, flags); 2338 2339 if (sk->sk_state == IUCV_CLOSING) { 2340 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2341 sk->sk_state = IUCV_CLOSED; 2342 sk->sk_state_change(sk); 2343 } 2344 } 2345 2346 } 2347 2348 /* 2349 * afiucv_netdev_event: handle netdev notifier chain events 2350 */ 2351 static int afiucv_netdev_event(struct notifier_block *this, 2352 unsigned long event, void *ptr) 2353 { 2354 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2355 struct sock *sk; 2356 struct iucv_sock *iucv; 2357 2358 switch (event) { 2359 case NETDEV_REBOOT: 2360 case NETDEV_GOING_DOWN: 2361 sk_for_each(sk, &iucv_sk_list.head) { 2362 iucv = iucv_sk(sk); 2363 if ((iucv->hs_dev == event_dev) && 2364 (sk->sk_state == IUCV_CONNECTED)) { 2365 if (event == NETDEV_GOING_DOWN) 2366 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2367 sk->sk_state = IUCV_DISCONN; 2368 sk->sk_state_change(sk); 2369 } 2370 } 2371 break; 2372 case NETDEV_DOWN: 2373 case NETDEV_UNREGISTER: 2374 default: 2375 break; 2376 } 2377 return NOTIFY_DONE; 2378 } 2379 2380 static struct notifier_block afiucv_netdev_notifier = { 2381 .notifier_call = afiucv_netdev_event, 2382 }; 2383 2384 static const struct proto_ops iucv_sock_ops = { 2385 .family = PF_IUCV, 2386 .owner = THIS_MODULE, 2387 .release = iucv_sock_release, 2388 .bind = iucv_sock_bind, 2389 .connect = iucv_sock_connect, 2390 .listen = iucv_sock_listen, 2391 .accept = iucv_sock_accept, 2392 .getname = iucv_sock_getname, 2393 .sendmsg = iucv_sock_sendmsg, 2394 .recvmsg = iucv_sock_recvmsg, 2395 .poll = iucv_sock_poll, 2396 .ioctl = sock_no_ioctl, 2397 .mmap = sock_no_mmap, 2398 .socketpair = sock_no_socketpair, 2399 .shutdown = iucv_sock_shutdown, 2400 .setsockopt = iucv_sock_setsockopt, 2401 .getsockopt = iucv_sock_getsockopt, 2402 }; 2403 2404 static const struct net_proto_family iucv_sock_family_ops = { 2405 .family = AF_IUCV, 2406 .owner = THIS_MODULE, 2407 .create = iucv_sock_create, 2408 }; 2409 2410 static struct packet_type iucv_packet_type = { 2411 .type = cpu_to_be16(ETH_P_AF_IUCV), 2412 .func = afiucv_hs_rcv, 2413 }; 2414 2415 static int afiucv_iucv_init(void) 2416 { 2417 int err; 2418 2419 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2420 if (err) 2421 goto out; 2422 /* establish dummy device */ 2423 af_iucv_driver.bus = pr_iucv->bus; 2424 err = driver_register(&af_iucv_driver); 2425 if (err) 2426 goto out_iucv; 2427 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 2428 if (!af_iucv_dev) { 2429 err = -ENOMEM; 2430 goto out_driver; 2431 } 2432 dev_set_name(af_iucv_dev, "af_iucv"); 2433 af_iucv_dev->bus = pr_iucv->bus; 2434 af_iucv_dev->parent = pr_iucv->root; 2435 af_iucv_dev->release = (void (*)(struct device *))kfree; 2436 af_iucv_dev->driver = &af_iucv_driver; 2437 err = device_register(af_iucv_dev); 2438 if (err) 2439 goto out_driver; 2440 return 0; 2441 2442 out_driver: 2443 driver_unregister(&af_iucv_driver); 2444 out_iucv: 2445 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2446 out: 2447 return err; 2448 } 2449 2450 static int __init afiucv_init(void) 2451 { 2452 int err; 2453 2454 if (MACHINE_IS_VM) { 2455 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2456 if (unlikely(err)) { 2457 WARN_ON(err); 2458 err = -EPROTONOSUPPORT; 2459 goto out; 2460 } 2461 2462 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2463 if (!pr_iucv) { 2464 printk(KERN_WARNING "iucv_if lookup failed\n"); 2465 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2466 } 2467 } else { 2468 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2469 pr_iucv = NULL; 2470 } 2471 2472 err = proto_register(&iucv_proto, 0); 2473 if (err) 2474 goto out; 2475 err = sock_register(&iucv_sock_family_ops); 2476 if (err) 2477 goto out_proto; 2478 2479 if (pr_iucv) { 2480 err = afiucv_iucv_init(); 2481 if (err) 2482 goto out_sock; 2483 } else 2484 register_netdevice_notifier(&afiucv_netdev_notifier); 2485 dev_add_pack(&iucv_packet_type); 2486 return 0; 2487 2488 out_sock: 2489 sock_unregister(PF_IUCV); 2490 out_proto: 2491 proto_unregister(&iucv_proto); 2492 out: 2493 if (pr_iucv) 2494 symbol_put(iucv_if); 2495 return err; 2496 } 2497 2498 static void __exit afiucv_exit(void) 2499 { 2500 if (pr_iucv) { 2501 device_unregister(af_iucv_dev); 2502 driver_unregister(&af_iucv_driver); 2503 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2504 symbol_put(iucv_if); 2505 } else 2506 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2507 dev_remove_pack(&iucv_packet_type); 2508 sock_unregister(PF_IUCV); 2509 proto_unregister(&iucv_proto); 2510 } 2511 2512 module_init(afiucv_init); 2513 module_exit(afiucv_exit); 2514 2515 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2516 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2517 MODULE_VERSION(VERSION); 2518 MODULE_LICENSE("GPL"); 2519 MODULE_ALIAS_NETPROTO(PF_IUCV); 2520 2521