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 = skb_push(skb, sizeof(struct af_iucv_trans_hdr)); 326 skb_reset_mac_header(skb); 327 skb_reset_network_header(skb); 328 skb_push(skb, ETH_HLEN); 329 skb_reset_mac_header(skb); 330 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); 331 332 phs_hdr->magic = ETH_P_AF_IUCV; 333 phs_hdr->version = 1; 334 phs_hdr->flags = flags; 335 if (flags == AF_IUCV_FLAG_SYN) 336 phs_hdr->window = iucv->msglimit; 337 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 338 confirm_recv = atomic_read(&iucv->msg_recv); 339 phs_hdr->window = confirm_recv; 340 if (confirm_recv) 341 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 342 } 343 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 344 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 345 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 346 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 347 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 348 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 349 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 350 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 351 if (imsg) 352 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 353 354 skb->dev = iucv->hs_dev; 355 if (!skb->dev) 356 return -ENODEV; 357 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) 358 return -ENETDOWN; 359 if (skb->len > skb->dev->mtu) { 360 if (sock->sk_type == SOCK_SEQPACKET) 361 return -EMSGSIZE; 362 else 363 skb_trim(skb, skb->dev->mtu); 364 } 365 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); 366 nskb = skb_clone(skb, GFP_ATOMIC); 367 if (!nskb) 368 return -ENOMEM; 369 skb_queue_tail(&iucv->send_skb_q, nskb); 370 err = dev_queue_xmit(skb); 371 if (net_xmit_eval(err)) { 372 skb_unlink(nskb, &iucv->send_skb_q); 373 kfree_skb(nskb); 374 } else { 375 atomic_sub(confirm_recv, &iucv->msg_recv); 376 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 377 } 378 return net_xmit_eval(err); 379 } 380 381 static struct sock *__iucv_get_sock_by_name(char *nm) 382 { 383 struct sock *sk; 384 385 sk_for_each(sk, &iucv_sk_list.head) 386 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 387 return sk; 388 389 return NULL; 390 } 391 392 static void iucv_sock_destruct(struct sock *sk) 393 { 394 skb_queue_purge(&sk->sk_receive_queue); 395 skb_queue_purge(&sk->sk_error_queue); 396 397 sk_mem_reclaim(sk); 398 399 if (!sock_flag(sk, SOCK_DEAD)) { 400 pr_err("Attempt to release alive iucv socket %p\n", sk); 401 return; 402 } 403 404 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 405 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 406 WARN_ON(sk->sk_wmem_queued); 407 WARN_ON(sk->sk_forward_alloc); 408 } 409 410 /* Cleanup Listen */ 411 static void iucv_sock_cleanup_listen(struct sock *parent) 412 { 413 struct sock *sk; 414 415 /* Close non-accepted connections */ 416 while ((sk = iucv_accept_dequeue(parent, NULL))) { 417 iucv_sock_close(sk); 418 iucv_sock_kill(sk); 419 } 420 421 parent->sk_state = IUCV_CLOSED; 422 } 423 424 /* Kill socket (only if zapped and orphaned) */ 425 static void iucv_sock_kill(struct sock *sk) 426 { 427 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 428 return; 429 430 iucv_sock_unlink(&iucv_sk_list, sk); 431 sock_set_flag(sk, SOCK_DEAD); 432 sock_put(sk); 433 } 434 435 /* Terminate an IUCV path */ 436 static void iucv_sever_path(struct sock *sk, int with_user_data) 437 { 438 unsigned char user_data[16]; 439 struct iucv_sock *iucv = iucv_sk(sk); 440 struct iucv_path *path = iucv->path; 441 442 if (iucv->path) { 443 iucv->path = NULL; 444 if (with_user_data) { 445 low_nmcpy(user_data, iucv->src_name); 446 high_nmcpy(user_data, iucv->dst_name); 447 ASCEBC(user_data, sizeof(user_data)); 448 pr_iucv->path_sever(path, user_data); 449 } else 450 pr_iucv->path_sever(path, NULL); 451 iucv_path_free(path); 452 } 453 } 454 455 /* Send controlling flags through an IUCV socket for HIPER transport */ 456 static int iucv_send_ctrl(struct sock *sk, u8 flags) 457 { 458 int err = 0; 459 int blen; 460 struct sk_buff *skb; 461 u8 shutdown = 0; 462 463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 464 if (sk->sk_shutdown & SEND_SHUTDOWN) { 465 /* controlling flags should be sent anyway */ 466 shutdown = sk->sk_shutdown; 467 sk->sk_shutdown &= RCV_SHUTDOWN; 468 } 469 skb = sock_alloc_send_skb(sk, blen, 1, &err); 470 if (skb) { 471 skb_reserve(skb, blen); 472 err = afiucv_hs_send(NULL, sk, skb, flags); 473 } 474 if (shutdown) 475 sk->sk_shutdown = shutdown; 476 return err; 477 } 478 479 /* Close an IUCV socket */ 480 static void iucv_sock_close(struct sock *sk) 481 { 482 struct iucv_sock *iucv = iucv_sk(sk); 483 unsigned long timeo; 484 int err = 0; 485 486 lock_sock(sk); 487 488 switch (sk->sk_state) { 489 case IUCV_LISTEN: 490 iucv_sock_cleanup_listen(sk); 491 break; 492 493 case IUCV_CONNECTED: 494 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 495 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 496 sk->sk_state = IUCV_DISCONN; 497 sk->sk_state_change(sk); 498 } 499 case IUCV_DISCONN: /* fall through */ 500 sk->sk_state = IUCV_CLOSING; 501 sk->sk_state_change(sk); 502 503 if (!err && !skb_queue_empty(&iucv->send_skb_q)) { 504 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 505 timeo = sk->sk_lingertime; 506 else 507 timeo = IUCV_DISCONN_TIMEOUT; 508 iucv_sock_wait(sk, 509 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 510 timeo); 511 } 512 513 case IUCV_CLOSING: /* fall through */ 514 sk->sk_state = IUCV_CLOSED; 515 sk->sk_state_change(sk); 516 517 sk->sk_err = ECONNRESET; 518 sk->sk_state_change(sk); 519 520 skb_queue_purge(&iucv->send_skb_q); 521 skb_queue_purge(&iucv->backlog_skb_q); 522 523 default: /* fall through */ 524 iucv_sever_path(sk, 1); 525 } 526 527 if (iucv->hs_dev) { 528 dev_put(iucv->hs_dev); 529 iucv->hs_dev = NULL; 530 sk->sk_bound_dev_if = 0; 531 } 532 533 /* mark socket for deletion by iucv_sock_kill() */ 534 sock_set_flag(sk, SOCK_ZAPPED); 535 536 release_sock(sk); 537 } 538 539 static void iucv_sock_init(struct sock *sk, struct sock *parent) 540 { 541 if (parent) { 542 sk->sk_type = parent->sk_type; 543 security_sk_clone(parent, sk); 544 } 545 } 546 547 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 548 { 549 struct sock *sk; 550 struct iucv_sock *iucv; 551 552 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 553 if (!sk) 554 return NULL; 555 iucv = iucv_sk(sk); 556 557 sock_init_data(sock, sk); 558 INIT_LIST_HEAD(&iucv->accept_q); 559 spin_lock_init(&iucv->accept_q_lock); 560 skb_queue_head_init(&iucv->send_skb_q); 561 INIT_LIST_HEAD(&iucv->message_q.list); 562 spin_lock_init(&iucv->message_q.lock); 563 skb_queue_head_init(&iucv->backlog_skb_q); 564 iucv->send_tag = 0; 565 atomic_set(&iucv->pendings, 0); 566 iucv->flags = 0; 567 iucv->msglimit = 0; 568 atomic_set(&iucv->msg_sent, 0); 569 atomic_set(&iucv->msg_recv, 0); 570 iucv->path = NULL; 571 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 572 memset(&iucv->src_user_id , 0, 32); 573 if (pr_iucv) 574 iucv->transport = AF_IUCV_TRANS_IUCV; 575 else 576 iucv->transport = AF_IUCV_TRANS_HIPER; 577 578 sk->sk_destruct = iucv_sock_destruct; 579 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 580 sk->sk_allocation = GFP_DMA; 581 582 sock_reset_flag(sk, SOCK_ZAPPED); 583 584 sk->sk_protocol = proto; 585 sk->sk_state = IUCV_OPEN; 586 587 iucv_sock_link(&iucv_sk_list, sk); 588 return sk; 589 } 590 591 /* Create an IUCV socket */ 592 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 593 int kern) 594 { 595 struct sock *sk; 596 597 if (protocol && protocol != PF_IUCV) 598 return -EPROTONOSUPPORT; 599 600 sock->state = SS_UNCONNECTED; 601 602 switch (sock->type) { 603 case SOCK_STREAM: 604 sock->ops = &iucv_sock_ops; 605 break; 606 case SOCK_SEQPACKET: 607 /* currently, proto ops can handle both sk types */ 608 sock->ops = &iucv_sock_ops; 609 break; 610 default: 611 return -ESOCKTNOSUPPORT; 612 } 613 614 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 615 if (!sk) 616 return -ENOMEM; 617 618 iucv_sock_init(sk, NULL); 619 620 return 0; 621 } 622 623 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 624 { 625 write_lock_bh(&l->lock); 626 sk_add_node(sk, &l->head); 627 write_unlock_bh(&l->lock); 628 } 629 630 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 631 { 632 write_lock_bh(&l->lock); 633 sk_del_node_init(sk); 634 write_unlock_bh(&l->lock); 635 } 636 637 void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 638 { 639 unsigned long flags; 640 struct iucv_sock *par = iucv_sk(parent); 641 642 sock_hold(sk); 643 spin_lock_irqsave(&par->accept_q_lock, flags); 644 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 645 spin_unlock_irqrestore(&par->accept_q_lock, flags); 646 iucv_sk(sk)->parent = parent; 647 sk_acceptq_added(parent); 648 } 649 650 void iucv_accept_unlink(struct sock *sk) 651 { 652 unsigned long flags; 653 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 654 655 spin_lock_irqsave(&par->accept_q_lock, flags); 656 list_del_init(&iucv_sk(sk)->accept_q); 657 spin_unlock_irqrestore(&par->accept_q_lock, flags); 658 sk_acceptq_removed(iucv_sk(sk)->parent); 659 iucv_sk(sk)->parent = NULL; 660 sock_put(sk); 661 } 662 663 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 664 { 665 struct iucv_sock *isk, *n; 666 struct sock *sk; 667 668 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 669 sk = (struct sock *) isk; 670 lock_sock(sk); 671 672 if (sk->sk_state == IUCV_CLOSED) { 673 iucv_accept_unlink(sk); 674 release_sock(sk); 675 continue; 676 } 677 678 if (sk->sk_state == IUCV_CONNECTED || 679 sk->sk_state == IUCV_DISCONN || 680 !newsock) { 681 iucv_accept_unlink(sk); 682 if (newsock) 683 sock_graft(sk, newsock); 684 685 release_sock(sk); 686 return sk; 687 } 688 689 release_sock(sk); 690 } 691 return NULL; 692 } 693 694 static void __iucv_auto_name(struct iucv_sock *iucv) 695 { 696 char name[12]; 697 698 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 699 while (__iucv_get_sock_by_name(name)) { 700 sprintf(name, "%08x", 701 atomic_inc_return(&iucv_sk_list.autobind_name)); 702 } 703 memcpy(iucv->src_name, name, 8); 704 } 705 706 /* Bind an unbound socket */ 707 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 708 int addr_len) 709 { 710 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 711 struct sock *sk = sock->sk; 712 struct iucv_sock *iucv; 713 int err = 0; 714 struct net_device *dev; 715 char uid[9]; 716 717 /* Verify the input sockaddr */ 718 if (addr_len < sizeof(struct sockaddr_iucv) || 719 addr->sa_family != AF_IUCV) 720 return -EINVAL; 721 722 lock_sock(sk); 723 if (sk->sk_state != IUCV_OPEN) { 724 err = -EBADFD; 725 goto done; 726 } 727 728 write_lock_bh(&iucv_sk_list.lock); 729 730 iucv = iucv_sk(sk); 731 if (__iucv_get_sock_by_name(sa->siucv_name)) { 732 err = -EADDRINUSE; 733 goto done_unlock; 734 } 735 if (iucv->path) 736 goto done_unlock; 737 738 /* Bind the socket */ 739 if (pr_iucv) 740 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 741 goto vm_bind; /* VM IUCV transport */ 742 743 /* try hiper transport */ 744 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 745 ASCEBC(uid, 8); 746 rcu_read_lock(); 747 for_each_netdev_rcu(&init_net, dev) { 748 if (!memcmp(dev->perm_addr, uid, 8)) { 749 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 750 /* Check for unitialized siucv_name */ 751 if (strncmp(sa->siucv_name, " ", 8) == 0) 752 __iucv_auto_name(iucv); 753 else 754 memcpy(iucv->src_name, sa->siucv_name, 8); 755 sk->sk_bound_dev_if = dev->ifindex; 756 iucv->hs_dev = dev; 757 dev_hold(dev); 758 sk->sk_state = IUCV_BOUND; 759 iucv->transport = AF_IUCV_TRANS_HIPER; 760 if (!iucv->msglimit) 761 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 762 rcu_read_unlock(); 763 goto done_unlock; 764 } 765 } 766 rcu_read_unlock(); 767 vm_bind: 768 if (pr_iucv) { 769 /* use local userid for backward compat */ 770 memcpy(iucv->src_name, sa->siucv_name, 8); 771 memcpy(iucv->src_user_id, iucv_userid, 8); 772 sk->sk_state = IUCV_BOUND; 773 iucv->transport = AF_IUCV_TRANS_IUCV; 774 if (!iucv->msglimit) 775 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 776 goto done_unlock; 777 } 778 /* found no dev to bind */ 779 err = -ENODEV; 780 done_unlock: 781 /* Release the socket list lock */ 782 write_unlock_bh(&iucv_sk_list.lock); 783 done: 784 release_sock(sk); 785 return err; 786 } 787 788 /* Automatically bind an unbound socket */ 789 static int iucv_sock_autobind(struct sock *sk) 790 { 791 struct iucv_sock *iucv = iucv_sk(sk); 792 int err = 0; 793 794 if (unlikely(!pr_iucv)) 795 return -EPROTO; 796 797 memcpy(iucv->src_user_id, iucv_userid, 8); 798 799 write_lock_bh(&iucv_sk_list.lock); 800 __iucv_auto_name(iucv); 801 write_unlock_bh(&iucv_sk_list.lock); 802 803 if (!iucv->msglimit) 804 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 805 806 return err; 807 } 808 809 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 810 { 811 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 812 struct sock *sk = sock->sk; 813 struct iucv_sock *iucv = iucv_sk(sk); 814 unsigned char user_data[16]; 815 int err; 816 817 high_nmcpy(user_data, sa->siucv_name); 818 low_nmcpy(user_data, iucv->src_name); 819 ASCEBC(user_data, sizeof(user_data)); 820 821 /* Create path. */ 822 iucv->path = iucv_path_alloc(iucv->msglimit, 823 IUCV_IPRMDATA, GFP_KERNEL); 824 if (!iucv->path) { 825 err = -ENOMEM; 826 goto done; 827 } 828 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 829 sa->siucv_user_id, NULL, user_data, 830 sk); 831 if (err) { 832 iucv_path_free(iucv->path); 833 iucv->path = NULL; 834 switch (err) { 835 case 0x0b: /* Target communicator is not logged on */ 836 err = -ENETUNREACH; 837 break; 838 case 0x0d: /* Max connections for this guest exceeded */ 839 case 0x0e: /* Max connections for target guest exceeded */ 840 err = -EAGAIN; 841 break; 842 case 0x0f: /* Missing IUCV authorization */ 843 err = -EACCES; 844 break; 845 default: 846 err = -ECONNREFUSED; 847 break; 848 } 849 } 850 done: 851 return err; 852 } 853 854 /* Connect an unconnected socket */ 855 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 856 int alen, int flags) 857 { 858 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 859 struct sock *sk = sock->sk; 860 struct iucv_sock *iucv = iucv_sk(sk); 861 int err; 862 863 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) 864 return -EINVAL; 865 866 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 867 return -EBADFD; 868 869 if (sk->sk_state == IUCV_OPEN && 870 iucv->transport == AF_IUCV_TRANS_HIPER) 871 return -EBADFD; /* explicit bind required */ 872 873 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 874 return -EINVAL; 875 876 if (sk->sk_state == IUCV_OPEN) { 877 err = iucv_sock_autobind(sk); 878 if (unlikely(err)) 879 return err; 880 } 881 882 lock_sock(sk); 883 884 /* Set the destination information */ 885 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 886 memcpy(iucv->dst_name, sa->siucv_name, 8); 887 888 if (iucv->transport == AF_IUCV_TRANS_HIPER) 889 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 890 else 891 err = afiucv_path_connect(sock, addr); 892 if (err) 893 goto done; 894 895 if (sk->sk_state != IUCV_CONNECTED) 896 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 897 IUCV_DISCONN), 898 sock_sndtimeo(sk, flags & O_NONBLOCK)); 899 900 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 901 err = -ECONNREFUSED; 902 903 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 904 iucv_sever_path(sk, 0); 905 906 done: 907 release_sock(sk); 908 return err; 909 } 910 911 /* Move a socket into listening state. */ 912 static int iucv_sock_listen(struct socket *sock, int backlog) 913 { 914 struct sock *sk = sock->sk; 915 int err; 916 917 lock_sock(sk); 918 919 err = -EINVAL; 920 if (sk->sk_state != IUCV_BOUND) 921 goto done; 922 923 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 924 goto done; 925 926 sk->sk_max_ack_backlog = backlog; 927 sk->sk_ack_backlog = 0; 928 sk->sk_state = IUCV_LISTEN; 929 err = 0; 930 931 done: 932 release_sock(sk); 933 return err; 934 } 935 936 /* Accept a pending connection */ 937 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 938 int flags, bool kern) 939 { 940 DECLARE_WAITQUEUE(wait, current); 941 struct sock *sk = sock->sk, *nsk; 942 long timeo; 943 int err = 0; 944 945 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 946 947 if (sk->sk_state != IUCV_LISTEN) { 948 err = -EBADFD; 949 goto done; 950 } 951 952 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 953 954 /* Wait for an incoming connection */ 955 add_wait_queue_exclusive(sk_sleep(sk), &wait); 956 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 957 set_current_state(TASK_INTERRUPTIBLE); 958 if (!timeo) { 959 err = -EAGAIN; 960 break; 961 } 962 963 release_sock(sk); 964 timeo = schedule_timeout(timeo); 965 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 966 967 if (sk->sk_state != IUCV_LISTEN) { 968 err = -EBADFD; 969 break; 970 } 971 972 if (signal_pending(current)) { 973 err = sock_intr_errno(timeo); 974 break; 975 } 976 } 977 978 set_current_state(TASK_RUNNING); 979 remove_wait_queue(sk_sleep(sk), &wait); 980 981 if (err) 982 goto done; 983 984 newsock->state = SS_CONNECTED; 985 986 done: 987 release_sock(sk); 988 return err; 989 } 990 991 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 992 int *len, int peer) 993 { 994 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 995 struct sock *sk = sock->sk; 996 struct iucv_sock *iucv = iucv_sk(sk); 997 998 addr->sa_family = AF_IUCV; 999 *len = sizeof(struct sockaddr_iucv); 1000 1001 if (peer) { 1002 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 1003 memcpy(siucv->siucv_name, iucv->dst_name, 8); 1004 } else { 1005 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 1006 memcpy(siucv->siucv_name, iucv->src_name, 8); 1007 } 1008 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 1009 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 1010 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 1011 1012 return 0; 1013 } 1014 1015 /** 1016 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 1017 * @path: IUCV path 1018 * @msg: Pointer to a struct iucv_message 1019 * @skb: The socket data to send, skb->len MUST BE <= 7 1020 * 1021 * Send the socket data in the parameter list in the iucv message 1022 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 1023 * list and the socket data len at index 7 (last byte). 1024 * See also iucv_msg_length(). 1025 * 1026 * Returns the error code from the iucv_message_send() call. 1027 */ 1028 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 1029 struct sk_buff *skb) 1030 { 1031 u8 prmdata[8]; 1032 1033 memcpy(prmdata, (void *) skb->data, skb->len); 1034 prmdata[7] = 0xff - (u8) skb->len; 1035 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 1036 (void *) prmdata, 8); 1037 } 1038 1039 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 1040 size_t len) 1041 { 1042 struct sock *sk = sock->sk; 1043 struct iucv_sock *iucv = iucv_sk(sk); 1044 size_t headroom = 0; 1045 size_t linear; 1046 struct sk_buff *skb; 1047 struct iucv_message txmsg = {0}; 1048 struct cmsghdr *cmsg; 1049 int cmsg_done; 1050 long timeo; 1051 char user_id[9]; 1052 char appl_id[9]; 1053 int err; 1054 int noblock = msg->msg_flags & MSG_DONTWAIT; 1055 1056 err = sock_error(sk); 1057 if (err) 1058 return err; 1059 1060 if (msg->msg_flags & MSG_OOB) 1061 return -EOPNOTSUPP; 1062 1063 /* SOCK_SEQPACKET: we do not support segmented records */ 1064 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 1065 return -EOPNOTSUPP; 1066 1067 lock_sock(sk); 1068 1069 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1070 err = -EPIPE; 1071 goto out; 1072 } 1073 1074 /* Return if the socket is not in connected state */ 1075 if (sk->sk_state != IUCV_CONNECTED) { 1076 err = -ENOTCONN; 1077 goto out; 1078 } 1079 1080 /* initialize defaults */ 1081 cmsg_done = 0; /* check for duplicate headers */ 1082 txmsg.class = 0; 1083 1084 /* iterate over control messages */ 1085 for_each_cmsghdr(cmsg, msg) { 1086 if (!CMSG_OK(msg, cmsg)) { 1087 err = -EINVAL; 1088 goto out; 1089 } 1090 1091 if (cmsg->cmsg_level != SOL_IUCV) 1092 continue; 1093 1094 if (cmsg->cmsg_type & cmsg_done) { 1095 err = -EINVAL; 1096 goto out; 1097 } 1098 cmsg_done |= cmsg->cmsg_type; 1099 1100 switch (cmsg->cmsg_type) { 1101 case SCM_IUCV_TRGCLS: 1102 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 1103 err = -EINVAL; 1104 goto out; 1105 } 1106 1107 /* set iucv message target class */ 1108 memcpy(&txmsg.class, 1109 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 1110 1111 break; 1112 1113 default: 1114 err = -EINVAL; 1115 goto out; 1116 } 1117 } 1118 1119 /* allocate one skb for each iucv message: 1120 * this is fine for SOCK_SEQPACKET (unless we want to support 1121 * segmented records using the MSG_EOR flag), but 1122 * for SOCK_STREAM we might want to improve it in future */ 1123 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1124 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 1125 linear = len; 1126 } else { 1127 if (len < PAGE_SIZE) { 1128 linear = len; 1129 } else { 1130 /* In nonlinear "classic" iucv skb, 1131 * reserve space for iucv_array 1132 */ 1133 headroom = sizeof(struct iucv_array) * 1134 (MAX_SKB_FRAGS + 1); 1135 linear = PAGE_SIZE - headroom; 1136 } 1137 } 1138 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, 1139 noblock, &err, 0); 1140 if (!skb) 1141 goto out; 1142 if (headroom) 1143 skb_reserve(skb, headroom); 1144 skb_put(skb, linear); 1145 skb->len = len; 1146 skb->data_len = len - linear; 1147 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); 1148 if (err) 1149 goto fail; 1150 1151 /* wait if outstanding messages for iucv path has reached */ 1152 timeo = sock_sndtimeo(sk, noblock); 1153 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1154 if (err) 1155 goto fail; 1156 1157 /* return -ECONNRESET if the socket is no longer connected */ 1158 if (sk->sk_state != IUCV_CONNECTED) { 1159 err = -ECONNRESET; 1160 goto fail; 1161 } 1162 1163 /* increment and save iucv message tag for msg_completion cbk */ 1164 txmsg.tag = iucv->send_tag++; 1165 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1166 1167 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1168 atomic_inc(&iucv->msg_sent); 1169 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1170 if (err) { 1171 atomic_dec(&iucv->msg_sent); 1172 goto fail; 1173 } 1174 } else { /* Classic VM IUCV transport */ 1175 skb_queue_tail(&iucv->send_skb_q, skb); 1176 1177 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && 1178 skb->len <= 7) { 1179 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1180 1181 /* on success: there is no message_complete callback */ 1182 /* for an IPRMDATA msg; remove skb from send queue */ 1183 if (err == 0) { 1184 skb_unlink(skb, &iucv->send_skb_q); 1185 kfree_skb(skb); 1186 } 1187 1188 /* this error should never happen since the */ 1189 /* IUCV_IPRMDATA path flag is set... sever path */ 1190 if (err == 0x15) { 1191 pr_iucv->path_sever(iucv->path, NULL); 1192 skb_unlink(skb, &iucv->send_skb_q); 1193 err = -EPIPE; 1194 goto fail; 1195 } 1196 } else if (skb_is_nonlinear(skb)) { 1197 struct iucv_array *iba = (struct iucv_array *)skb->head; 1198 int i; 1199 1200 /* skip iucv_array lying in the headroom */ 1201 iba[0].address = (u32)(addr_t)skb->data; 1202 iba[0].length = (u32)skb_headlen(skb); 1203 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1204 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1205 1206 iba[i + 1].address = 1207 (u32)(addr_t)skb_frag_address(frag); 1208 iba[i + 1].length = (u32)skb_frag_size(frag); 1209 } 1210 err = pr_iucv->message_send(iucv->path, &txmsg, 1211 IUCV_IPBUFLST, 0, 1212 (void *)iba, skb->len); 1213 } else { /* non-IPRM Linear skb */ 1214 err = pr_iucv->message_send(iucv->path, &txmsg, 1215 0, 0, (void *)skb->data, skb->len); 1216 } 1217 if (err) { 1218 if (err == 3) { 1219 user_id[8] = 0; 1220 memcpy(user_id, iucv->dst_user_id, 8); 1221 appl_id[8] = 0; 1222 memcpy(appl_id, iucv->dst_name, 8); 1223 pr_err( 1224 "Application %s on z/VM guest %s exceeds message limit\n", 1225 appl_id, user_id); 1226 err = -EAGAIN; 1227 } else { 1228 err = -EPIPE; 1229 } 1230 skb_unlink(skb, &iucv->send_skb_q); 1231 goto fail; 1232 } 1233 } 1234 1235 release_sock(sk); 1236 return len; 1237 1238 fail: 1239 kfree_skb(skb); 1240 out: 1241 release_sock(sk); 1242 return err; 1243 } 1244 1245 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) 1246 { 1247 size_t headroom, linear; 1248 struct sk_buff *skb; 1249 int err; 1250 1251 if (len < PAGE_SIZE) { 1252 headroom = 0; 1253 linear = len; 1254 } else { 1255 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); 1256 linear = PAGE_SIZE - headroom; 1257 } 1258 skb = alloc_skb_with_frags(headroom + linear, len - linear, 1259 0, &err, GFP_ATOMIC | GFP_DMA); 1260 WARN_ONCE(!skb, 1261 "alloc of recv iucv skb len=%lu failed with errcode=%d\n", 1262 len, err); 1263 if (skb) { 1264 if (headroom) 1265 skb_reserve(skb, headroom); 1266 skb_put(skb, linear); 1267 skb->len = len; 1268 skb->data_len = len - linear; 1269 } 1270 return skb; 1271 } 1272 1273 /* iucv_process_message() - Receive a single outstanding IUCV message 1274 * 1275 * Locking: must be called with message_q.lock held 1276 */ 1277 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1278 struct iucv_path *path, 1279 struct iucv_message *msg) 1280 { 1281 int rc; 1282 unsigned int len; 1283 1284 len = iucv_msg_length(msg); 1285 1286 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1287 /* Note: the first 4 bytes are reserved for msg tag */ 1288 IUCV_SKB_CB(skb)->class = msg->class; 1289 1290 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1291 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1292 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1293 skb->data = NULL; 1294 skb->len = 0; 1295 } 1296 } else { 1297 if (skb_is_nonlinear(skb)) { 1298 struct iucv_array *iba = (struct iucv_array *)skb->head; 1299 int i; 1300 1301 iba[0].address = (u32)(addr_t)skb->data; 1302 iba[0].length = (u32)skb_headlen(skb); 1303 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1304 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1305 1306 iba[i + 1].address = 1307 (u32)(addr_t)skb_frag_address(frag); 1308 iba[i + 1].length = (u32)skb_frag_size(frag); 1309 } 1310 rc = pr_iucv->message_receive(path, msg, 1311 IUCV_IPBUFLST, 1312 (void *)iba, len, NULL); 1313 } else { 1314 rc = pr_iucv->message_receive(path, msg, 1315 msg->flags & IUCV_IPRMDATA, 1316 skb->data, len, NULL); 1317 } 1318 if (rc) { 1319 kfree_skb(skb); 1320 return; 1321 } 1322 WARN_ON_ONCE(skb->len != len); 1323 } 1324 1325 IUCV_SKB_CB(skb)->offset = 0; 1326 if (sk_filter(sk, skb)) { 1327 atomic_inc(&sk->sk_drops); /* skb rejected by filter */ 1328 kfree_skb(skb); 1329 return; 1330 } 1331 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ 1332 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 1333 } 1334 1335 /* iucv_process_message_q() - Process outstanding IUCV messages 1336 * 1337 * Locking: must be called with message_q.lock held 1338 */ 1339 static void iucv_process_message_q(struct sock *sk) 1340 { 1341 struct iucv_sock *iucv = iucv_sk(sk); 1342 struct sk_buff *skb; 1343 struct sock_msg_q *p, *n; 1344 1345 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1346 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); 1347 if (!skb) 1348 break; 1349 iucv_process_message(sk, skb, p->path, &p->msg); 1350 list_del(&p->list); 1351 kfree(p); 1352 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1353 break; 1354 } 1355 } 1356 1357 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1358 size_t len, int flags) 1359 { 1360 int noblock = flags & MSG_DONTWAIT; 1361 struct sock *sk = sock->sk; 1362 struct iucv_sock *iucv = iucv_sk(sk); 1363 unsigned int copied, rlen; 1364 struct sk_buff *skb, *rskb, *cskb; 1365 int err = 0; 1366 u32 offset; 1367 1368 if ((sk->sk_state == IUCV_DISCONN) && 1369 skb_queue_empty(&iucv->backlog_skb_q) && 1370 skb_queue_empty(&sk->sk_receive_queue) && 1371 list_empty(&iucv->message_q.list)) 1372 return 0; 1373 1374 if (flags & (MSG_OOB)) 1375 return -EOPNOTSUPP; 1376 1377 /* receive/dequeue next skb: 1378 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1379 skb = skb_recv_datagram(sk, flags, noblock, &err); 1380 if (!skb) { 1381 if (sk->sk_shutdown & RCV_SHUTDOWN) 1382 return 0; 1383 return err; 1384 } 1385 1386 offset = IUCV_SKB_CB(skb)->offset; 1387 rlen = skb->len - offset; /* real length of skb */ 1388 copied = min_t(unsigned int, rlen, len); 1389 if (!rlen) 1390 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1391 1392 cskb = skb; 1393 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1394 if (!(flags & MSG_PEEK)) 1395 skb_queue_head(&sk->sk_receive_queue, skb); 1396 return -EFAULT; 1397 } 1398 1399 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1400 if (sk->sk_type == SOCK_SEQPACKET) { 1401 if (copied < rlen) 1402 msg->msg_flags |= MSG_TRUNC; 1403 /* each iucv message contains a complete record */ 1404 msg->msg_flags |= MSG_EOR; 1405 } 1406 1407 /* create control message to store iucv msg target class: 1408 * get the trgcls from the control buffer of the skb due to 1409 * fragmentation of original iucv message. */ 1410 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1411 sizeof(IUCV_SKB_CB(skb)->class), 1412 (void *)&IUCV_SKB_CB(skb)->class); 1413 if (err) { 1414 if (!(flags & MSG_PEEK)) 1415 skb_queue_head(&sk->sk_receive_queue, skb); 1416 return err; 1417 } 1418 1419 /* Mark read part of skb as used */ 1420 if (!(flags & MSG_PEEK)) { 1421 1422 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1423 if (sk->sk_type == SOCK_STREAM) { 1424 if (copied < rlen) { 1425 IUCV_SKB_CB(skb)->offset = offset + copied; 1426 skb_queue_head(&sk->sk_receive_queue, skb); 1427 goto done; 1428 } 1429 } 1430 1431 kfree_skb(skb); 1432 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1433 atomic_inc(&iucv->msg_recv); 1434 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1435 WARN_ON(1); 1436 iucv_sock_close(sk); 1437 return -EFAULT; 1438 } 1439 } 1440 1441 /* Queue backlog skbs */ 1442 spin_lock_bh(&iucv->message_q.lock); 1443 rskb = skb_dequeue(&iucv->backlog_skb_q); 1444 while (rskb) { 1445 IUCV_SKB_CB(rskb)->offset = 0; 1446 if (__sock_queue_rcv_skb(sk, rskb)) { 1447 /* handle rcv queue full */ 1448 skb_queue_head(&iucv->backlog_skb_q, 1449 rskb); 1450 break; 1451 } 1452 rskb = skb_dequeue(&iucv->backlog_skb_q); 1453 } 1454 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1455 if (!list_empty(&iucv->message_q.list)) 1456 iucv_process_message_q(sk); 1457 if (atomic_read(&iucv->msg_recv) >= 1458 iucv->msglimit / 2) { 1459 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1460 if (err) { 1461 sk->sk_state = IUCV_DISCONN; 1462 sk->sk_state_change(sk); 1463 } 1464 } 1465 } 1466 spin_unlock_bh(&iucv->message_q.lock); 1467 } 1468 1469 done: 1470 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1471 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1472 copied = rlen; 1473 1474 return copied; 1475 } 1476 1477 static inline __poll_t iucv_accept_poll(struct sock *parent) 1478 { 1479 struct iucv_sock *isk, *n; 1480 struct sock *sk; 1481 1482 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1483 sk = (struct sock *) isk; 1484 1485 if (sk->sk_state == IUCV_CONNECTED) 1486 return EPOLLIN | EPOLLRDNORM; 1487 } 1488 1489 return 0; 1490 } 1491 1492 __poll_t iucv_sock_poll(struct file *file, struct socket *sock, 1493 poll_table *wait) 1494 { 1495 struct sock *sk = sock->sk; 1496 __poll_t mask = 0; 1497 1498 sock_poll_wait(file, sk_sleep(sk), wait); 1499 1500 if (sk->sk_state == IUCV_LISTEN) 1501 return iucv_accept_poll(sk); 1502 1503 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1504 mask |= EPOLLERR | 1505 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); 1506 1507 if (sk->sk_shutdown & RCV_SHUTDOWN) 1508 mask |= EPOLLRDHUP; 1509 1510 if (sk->sk_shutdown == SHUTDOWN_MASK) 1511 mask |= EPOLLHUP; 1512 1513 if (!skb_queue_empty(&sk->sk_receive_queue) || 1514 (sk->sk_shutdown & RCV_SHUTDOWN)) 1515 mask |= EPOLLIN | EPOLLRDNORM; 1516 1517 if (sk->sk_state == IUCV_CLOSED) 1518 mask |= EPOLLHUP; 1519 1520 if (sk->sk_state == IUCV_DISCONN) 1521 mask |= EPOLLIN; 1522 1523 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1524 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1525 else 1526 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1527 1528 return mask; 1529 } 1530 1531 static int iucv_sock_shutdown(struct socket *sock, int how) 1532 { 1533 struct sock *sk = sock->sk; 1534 struct iucv_sock *iucv = iucv_sk(sk); 1535 struct iucv_message txmsg; 1536 int err = 0; 1537 1538 how++; 1539 1540 if ((how & ~SHUTDOWN_MASK) || !how) 1541 return -EINVAL; 1542 1543 lock_sock(sk); 1544 switch (sk->sk_state) { 1545 case IUCV_LISTEN: 1546 case IUCV_DISCONN: 1547 case IUCV_CLOSING: 1548 case IUCV_CLOSED: 1549 err = -ENOTCONN; 1550 goto fail; 1551 default: 1552 break; 1553 } 1554 1555 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1556 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1557 txmsg.class = 0; 1558 txmsg.tag = 0; 1559 err = pr_iucv->message_send(iucv->path, &txmsg, 1560 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1561 if (err) { 1562 switch (err) { 1563 case 1: 1564 err = -ENOTCONN; 1565 break; 1566 case 2: 1567 err = -ECONNRESET; 1568 break; 1569 default: 1570 err = -ENOTCONN; 1571 break; 1572 } 1573 } 1574 } else 1575 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1576 } 1577 1578 sk->sk_shutdown |= how; 1579 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1580 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1581 iucv->path) { 1582 err = pr_iucv->path_quiesce(iucv->path, NULL); 1583 if (err) 1584 err = -ENOTCONN; 1585 /* skb_queue_purge(&sk->sk_receive_queue); */ 1586 } 1587 skb_queue_purge(&sk->sk_receive_queue); 1588 } 1589 1590 /* Wake up anyone sleeping in poll */ 1591 sk->sk_state_change(sk); 1592 1593 fail: 1594 release_sock(sk); 1595 return err; 1596 } 1597 1598 static int iucv_sock_release(struct socket *sock) 1599 { 1600 struct sock *sk = sock->sk; 1601 int err = 0; 1602 1603 if (!sk) 1604 return 0; 1605 1606 iucv_sock_close(sk); 1607 1608 sock_orphan(sk); 1609 iucv_sock_kill(sk); 1610 return err; 1611 } 1612 1613 /* getsockopt and setsockopt */ 1614 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1615 char __user *optval, unsigned int optlen) 1616 { 1617 struct sock *sk = sock->sk; 1618 struct iucv_sock *iucv = iucv_sk(sk); 1619 int val; 1620 int rc; 1621 1622 if (level != SOL_IUCV) 1623 return -ENOPROTOOPT; 1624 1625 if (optlen < sizeof(int)) 1626 return -EINVAL; 1627 1628 if (get_user(val, (int __user *) optval)) 1629 return -EFAULT; 1630 1631 rc = 0; 1632 1633 lock_sock(sk); 1634 switch (optname) { 1635 case SO_IPRMDATA_MSG: 1636 if (val) 1637 iucv->flags |= IUCV_IPRMDATA; 1638 else 1639 iucv->flags &= ~IUCV_IPRMDATA; 1640 break; 1641 case SO_MSGLIMIT: 1642 switch (sk->sk_state) { 1643 case IUCV_OPEN: 1644 case IUCV_BOUND: 1645 if (val < 1 || val > (u16)(~0)) 1646 rc = -EINVAL; 1647 else 1648 iucv->msglimit = val; 1649 break; 1650 default: 1651 rc = -EINVAL; 1652 break; 1653 } 1654 break; 1655 default: 1656 rc = -ENOPROTOOPT; 1657 break; 1658 } 1659 release_sock(sk); 1660 1661 return rc; 1662 } 1663 1664 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1665 char __user *optval, int __user *optlen) 1666 { 1667 struct sock *sk = sock->sk; 1668 struct iucv_sock *iucv = iucv_sk(sk); 1669 unsigned int val; 1670 int len; 1671 1672 if (level != SOL_IUCV) 1673 return -ENOPROTOOPT; 1674 1675 if (get_user(len, optlen)) 1676 return -EFAULT; 1677 1678 if (len < 0) 1679 return -EINVAL; 1680 1681 len = min_t(unsigned int, len, sizeof(int)); 1682 1683 switch (optname) { 1684 case SO_IPRMDATA_MSG: 1685 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1686 break; 1687 case SO_MSGLIMIT: 1688 lock_sock(sk); 1689 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1690 : iucv->msglimit; /* default */ 1691 release_sock(sk); 1692 break; 1693 case SO_MSGSIZE: 1694 if (sk->sk_state == IUCV_OPEN) 1695 return -EBADFD; 1696 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1697 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1698 0x7fffffff; 1699 break; 1700 default: 1701 return -ENOPROTOOPT; 1702 } 1703 1704 if (put_user(len, optlen)) 1705 return -EFAULT; 1706 if (copy_to_user(optval, &val, len)) 1707 return -EFAULT; 1708 1709 return 0; 1710 } 1711 1712 1713 /* Callback wrappers - called from iucv base support */ 1714 static int iucv_callback_connreq(struct iucv_path *path, 1715 u8 ipvmid[8], u8 ipuser[16]) 1716 { 1717 unsigned char user_data[16]; 1718 unsigned char nuser_data[16]; 1719 unsigned char src_name[8]; 1720 struct sock *sk, *nsk; 1721 struct iucv_sock *iucv, *niucv; 1722 int err; 1723 1724 memcpy(src_name, ipuser, 8); 1725 EBCASC(src_name, 8); 1726 /* Find out if this path belongs to af_iucv. */ 1727 read_lock(&iucv_sk_list.lock); 1728 iucv = NULL; 1729 sk = NULL; 1730 sk_for_each(sk, &iucv_sk_list.head) 1731 if (sk->sk_state == IUCV_LISTEN && 1732 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1733 /* 1734 * Found a listening socket with 1735 * src_name == ipuser[0-7]. 1736 */ 1737 iucv = iucv_sk(sk); 1738 break; 1739 } 1740 read_unlock(&iucv_sk_list.lock); 1741 if (!iucv) 1742 /* No socket found, not one of our paths. */ 1743 return -EINVAL; 1744 1745 bh_lock_sock(sk); 1746 1747 /* Check if parent socket is listening */ 1748 low_nmcpy(user_data, iucv->src_name); 1749 high_nmcpy(user_data, iucv->dst_name); 1750 ASCEBC(user_data, sizeof(user_data)); 1751 if (sk->sk_state != IUCV_LISTEN) { 1752 err = pr_iucv->path_sever(path, user_data); 1753 iucv_path_free(path); 1754 goto fail; 1755 } 1756 1757 /* Check for backlog size */ 1758 if (sk_acceptq_is_full(sk)) { 1759 err = pr_iucv->path_sever(path, user_data); 1760 iucv_path_free(path); 1761 goto fail; 1762 } 1763 1764 /* Create the new socket */ 1765 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1766 if (!nsk) { 1767 err = pr_iucv->path_sever(path, user_data); 1768 iucv_path_free(path); 1769 goto fail; 1770 } 1771 1772 niucv = iucv_sk(nsk); 1773 iucv_sock_init(nsk, sk); 1774 1775 /* Set the new iucv_sock */ 1776 memcpy(niucv->dst_name, ipuser + 8, 8); 1777 EBCASC(niucv->dst_name, 8); 1778 memcpy(niucv->dst_user_id, ipvmid, 8); 1779 memcpy(niucv->src_name, iucv->src_name, 8); 1780 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1781 niucv->path = path; 1782 1783 /* Call iucv_accept */ 1784 high_nmcpy(nuser_data, ipuser + 8); 1785 memcpy(nuser_data + 8, niucv->src_name, 8); 1786 ASCEBC(nuser_data + 8, 8); 1787 1788 /* set message limit for path based on msglimit of accepting socket */ 1789 niucv->msglimit = iucv->msglimit; 1790 path->msglim = iucv->msglimit; 1791 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1792 if (err) { 1793 iucv_sever_path(nsk, 1); 1794 iucv_sock_kill(nsk); 1795 goto fail; 1796 } 1797 1798 iucv_accept_enqueue(sk, nsk); 1799 1800 /* Wake up accept */ 1801 nsk->sk_state = IUCV_CONNECTED; 1802 sk->sk_data_ready(sk); 1803 err = 0; 1804 fail: 1805 bh_unlock_sock(sk); 1806 return 0; 1807 } 1808 1809 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1810 { 1811 struct sock *sk = path->private; 1812 1813 sk->sk_state = IUCV_CONNECTED; 1814 sk->sk_state_change(sk); 1815 } 1816 1817 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1818 { 1819 struct sock *sk = path->private; 1820 struct iucv_sock *iucv = iucv_sk(sk); 1821 struct sk_buff *skb; 1822 struct sock_msg_q *save_msg; 1823 int len; 1824 1825 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1826 pr_iucv->message_reject(path, msg); 1827 return; 1828 } 1829 1830 spin_lock(&iucv->message_q.lock); 1831 1832 if (!list_empty(&iucv->message_q.list) || 1833 !skb_queue_empty(&iucv->backlog_skb_q)) 1834 goto save_message; 1835 1836 len = atomic_read(&sk->sk_rmem_alloc); 1837 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1838 if (len > sk->sk_rcvbuf) 1839 goto save_message; 1840 1841 skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); 1842 if (!skb) 1843 goto save_message; 1844 1845 iucv_process_message(sk, skb, path, msg); 1846 goto out_unlock; 1847 1848 save_message: 1849 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1850 if (!save_msg) 1851 goto out_unlock; 1852 save_msg->path = path; 1853 save_msg->msg = *msg; 1854 1855 list_add_tail(&save_msg->list, &iucv->message_q.list); 1856 1857 out_unlock: 1858 spin_unlock(&iucv->message_q.lock); 1859 } 1860 1861 static void iucv_callback_txdone(struct iucv_path *path, 1862 struct iucv_message *msg) 1863 { 1864 struct sock *sk = path->private; 1865 struct sk_buff *this = NULL; 1866 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1867 struct sk_buff *list_skb = list->next; 1868 unsigned long flags; 1869 1870 bh_lock_sock(sk); 1871 if (!skb_queue_empty(list)) { 1872 spin_lock_irqsave(&list->lock, flags); 1873 1874 while (list_skb != (struct sk_buff *)list) { 1875 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1876 this = list_skb; 1877 break; 1878 } 1879 list_skb = list_skb->next; 1880 } 1881 if (this) 1882 __skb_unlink(this, list); 1883 1884 spin_unlock_irqrestore(&list->lock, flags); 1885 1886 if (this) { 1887 kfree_skb(this); 1888 /* wake up any process waiting for sending */ 1889 iucv_sock_wake_msglim(sk); 1890 } 1891 } 1892 1893 if (sk->sk_state == IUCV_CLOSING) { 1894 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1895 sk->sk_state = IUCV_CLOSED; 1896 sk->sk_state_change(sk); 1897 } 1898 } 1899 bh_unlock_sock(sk); 1900 1901 } 1902 1903 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1904 { 1905 struct sock *sk = path->private; 1906 1907 if (sk->sk_state == IUCV_CLOSED) 1908 return; 1909 1910 bh_lock_sock(sk); 1911 iucv_sever_path(sk, 1); 1912 sk->sk_state = IUCV_DISCONN; 1913 1914 sk->sk_state_change(sk); 1915 bh_unlock_sock(sk); 1916 } 1917 1918 /* called if the other communication side shuts down its RECV direction; 1919 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1920 */ 1921 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1922 { 1923 struct sock *sk = path->private; 1924 1925 bh_lock_sock(sk); 1926 if (sk->sk_state != IUCV_CLOSED) { 1927 sk->sk_shutdown |= SEND_SHUTDOWN; 1928 sk->sk_state_change(sk); 1929 } 1930 bh_unlock_sock(sk); 1931 } 1932 1933 /***************** HiperSockets transport callbacks ********************/ 1934 static void afiucv_swap_src_dest(struct sk_buff *skb) 1935 { 1936 struct af_iucv_trans_hdr *trans_hdr = 1937 (struct af_iucv_trans_hdr *)skb->data; 1938 char tmpID[8]; 1939 char tmpName[8]; 1940 1941 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1942 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1943 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1944 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1945 memcpy(tmpID, trans_hdr->srcUserID, 8); 1946 memcpy(tmpName, trans_hdr->srcAppName, 8); 1947 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1948 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1949 memcpy(trans_hdr->destUserID, tmpID, 8); 1950 memcpy(trans_hdr->destAppName, tmpName, 8); 1951 skb_push(skb, ETH_HLEN); 1952 memset(skb->data, 0, ETH_HLEN); 1953 } 1954 1955 /** 1956 * afiucv_hs_callback_syn - react on received SYN 1957 **/ 1958 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1959 { 1960 struct sock *nsk; 1961 struct iucv_sock *iucv, *niucv; 1962 struct af_iucv_trans_hdr *trans_hdr; 1963 int err; 1964 1965 iucv = iucv_sk(sk); 1966 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 1967 if (!iucv) { 1968 /* no sock - connection refused */ 1969 afiucv_swap_src_dest(skb); 1970 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1971 err = dev_queue_xmit(skb); 1972 goto out; 1973 } 1974 1975 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1976 bh_lock_sock(sk); 1977 if ((sk->sk_state != IUCV_LISTEN) || 1978 sk_acceptq_is_full(sk) || 1979 !nsk) { 1980 /* error on server socket - connection refused */ 1981 afiucv_swap_src_dest(skb); 1982 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1983 err = dev_queue_xmit(skb); 1984 iucv_sock_kill(nsk); 1985 bh_unlock_sock(sk); 1986 goto out; 1987 } 1988 1989 niucv = iucv_sk(nsk); 1990 iucv_sock_init(nsk, sk); 1991 niucv->transport = AF_IUCV_TRANS_HIPER; 1992 niucv->msglimit = iucv->msglimit; 1993 if (!trans_hdr->window) 1994 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1995 else 1996 niucv->msglimit_peer = trans_hdr->window; 1997 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1998 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1999 memcpy(niucv->src_name, iucv->src_name, 8); 2000 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 2001 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 2002 niucv->hs_dev = iucv->hs_dev; 2003 dev_hold(niucv->hs_dev); 2004 afiucv_swap_src_dest(skb); 2005 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 2006 trans_hdr->window = niucv->msglimit; 2007 /* if receiver acks the xmit connection is established */ 2008 err = dev_queue_xmit(skb); 2009 if (!err) { 2010 iucv_accept_enqueue(sk, nsk); 2011 nsk->sk_state = IUCV_CONNECTED; 2012 sk->sk_data_ready(sk); 2013 } else 2014 iucv_sock_kill(nsk); 2015 bh_unlock_sock(sk); 2016 2017 out: 2018 return NET_RX_SUCCESS; 2019 } 2020 2021 /** 2022 * afiucv_hs_callback_synack() - react on received SYN-ACK 2023 **/ 2024 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 2025 { 2026 struct iucv_sock *iucv = iucv_sk(sk); 2027 struct af_iucv_trans_hdr *trans_hdr = 2028 (struct af_iucv_trans_hdr *)skb->data; 2029 2030 if (!iucv) 2031 goto out; 2032 if (sk->sk_state != IUCV_BOUND) 2033 goto out; 2034 bh_lock_sock(sk); 2035 iucv->msglimit_peer = trans_hdr->window; 2036 sk->sk_state = IUCV_CONNECTED; 2037 sk->sk_state_change(sk); 2038 bh_unlock_sock(sk); 2039 out: 2040 kfree_skb(skb); 2041 return NET_RX_SUCCESS; 2042 } 2043 2044 /** 2045 * afiucv_hs_callback_synfin() - react on received SYN_FIN 2046 **/ 2047 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 2048 { 2049 struct iucv_sock *iucv = iucv_sk(sk); 2050 2051 if (!iucv) 2052 goto out; 2053 if (sk->sk_state != IUCV_BOUND) 2054 goto out; 2055 bh_lock_sock(sk); 2056 sk->sk_state = IUCV_DISCONN; 2057 sk->sk_state_change(sk); 2058 bh_unlock_sock(sk); 2059 out: 2060 kfree_skb(skb); 2061 return NET_RX_SUCCESS; 2062 } 2063 2064 /** 2065 * afiucv_hs_callback_fin() - react on received FIN 2066 **/ 2067 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 2068 { 2069 struct iucv_sock *iucv = iucv_sk(sk); 2070 2071 /* other end of connection closed */ 2072 if (!iucv) 2073 goto out; 2074 bh_lock_sock(sk); 2075 if (sk->sk_state == IUCV_CONNECTED) { 2076 sk->sk_state = IUCV_DISCONN; 2077 sk->sk_state_change(sk); 2078 } 2079 bh_unlock_sock(sk); 2080 out: 2081 kfree_skb(skb); 2082 return NET_RX_SUCCESS; 2083 } 2084 2085 /** 2086 * afiucv_hs_callback_win() - react on received WIN 2087 **/ 2088 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2089 { 2090 struct iucv_sock *iucv = iucv_sk(sk); 2091 struct af_iucv_trans_hdr *trans_hdr = 2092 (struct af_iucv_trans_hdr *)skb->data; 2093 2094 if (!iucv) 2095 return NET_RX_SUCCESS; 2096 2097 if (sk->sk_state != IUCV_CONNECTED) 2098 return NET_RX_SUCCESS; 2099 2100 atomic_sub(trans_hdr->window, &iucv->msg_sent); 2101 iucv_sock_wake_msglim(sk); 2102 return NET_RX_SUCCESS; 2103 } 2104 2105 /** 2106 * afiucv_hs_callback_rx() - react on received data 2107 **/ 2108 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2109 { 2110 struct iucv_sock *iucv = iucv_sk(sk); 2111 2112 if (!iucv) { 2113 kfree_skb(skb); 2114 return NET_RX_SUCCESS; 2115 } 2116 2117 if (sk->sk_state != IUCV_CONNECTED) { 2118 kfree_skb(skb); 2119 return NET_RX_SUCCESS; 2120 } 2121 2122 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2123 kfree_skb(skb); 2124 return NET_RX_SUCCESS; 2125 } 2126 2127 /* write stuff from iucv_msg to skb cb */ 2128 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2129 skb_reset_transport_header(skb); 2130 skb_reset_network_header(skb); 2131 IUCV_SKB_CB(skb)->offset = 0; 2132 if (sk_filter(sk, skb)) { 2133 atomic_inc(&sk->sk_drops); /* skb rejected by filter */ 2134 kfree_skb(skb); 2135 return NET_RX_SUCCESS; 2136 } 2137 2138 spin_lock(&iucv->message_q.lock); 2139 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2140 if (__sock_queue_rcv_skb(sk, skb)) 2141 /* handle rcv queue full */ 2142 skb_queue_tail(&iucv->backlog_skb_q, skb); 2143 } else 2144 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2145 spin_unlock(&iucv->message_q.lock); 2146 return NET_RX_SUCCESS; 2147 } 2148 2149 /** 2150 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2151 * transport 2152 * called from netif RX softirq 2153 **/ 2154 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2155 struct packet_type *pt, struct net_device *orig_dev) 2156 { 2157 struct sock *sk; 2158 struct iucv_sock *iucv; 2159 struct af_iucv_trans_hdr *trans_hdr; 2160 char nullstring[8]; 2161 int err = 0; 2162 2163 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) { 2164 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d", 2165 (int)skb->len, 2166 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr))); 2167 kfree_skb(skb); 2168 return NET_RX_SUCCESS; 2169 } 2170 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) 2171 if (skb_linearize(skb)) { 2172 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d", 2173 (int)skb->len); 2174 kfree_skb(skb); 2175 return NET_RX_SUCCESS; 2176 } 2177 skb_pull(skb, ETH_HLEN); 2178 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 2179 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2180 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2181 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2182 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2183 memset(nullstring, 0, sizeof(nullstring)); 2184 iucv = NULL; 2185 sk = NULL; 2186 read_lock(&iucv_sk_list.lock); 2187 sk_for_each(sk, &iucv_sk_list.head) { 2188 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2189 if ((!memcmp(&iucv_sk(sk)->src_name, 2190 trans_hdr->destAppName, 8)) && 2191 (!memcmp(&iucv_sk(sk)->src_user_id, 2192 trans_hdr->destUserID, 8)) && 2193 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2194 (!memcmp(&iucv_sk(sk)->dst_user_id, 2195 nullstring, 8))) { 2196 iucv = iucv_sk(sk); 2197 break; 2198 } 2199 } else { 2200 if ((!memcmp(&iucv_sk(sk)->src_name, 2201 trans_hdr->destAppName, 8)) && 2202 (!memcmp(&iucv_sk(sk)->src_user_id, 2203 trans_hdr->destUserID, 8)) && 2204 (!memcmp(&iucv_sk(sk)->dst_name, 2205 trans_hdr->srcAppName, 8)) && 2206 (!memcmp(&iucv_sk(sk)->dst_user_id, 2207 trans_hdr->srcUserID, 8))) { 2208 iucv = iucv_sk(sk); 2209 break; 2210 } 2211 } 2212 } 2213 read_unlock(&iucv_sk_list.lock); 2214 if (!iucv) 2215 sk = NULL; 2216 2217 /* no sock 2218 how should we send with no sock 2219 1) send without sock no send rc checking? 2220 2) introduce default sock to handle this cases 2221 2222 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2223 data -> send FIN 2224 SYN|ACK, SYN|FIN, FIN -> no action? */ 2225 2226 switch (trans_hdr->flags) { 2227 case AF_IUCV_FLAG_SYN: 2228 /* connect request */ 2229 err = afiucv_hs_callback_syn(sk, skb); 2230 break; 2231 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2232 /* connect request confirmed */ 2233 err = afiucv_hs_callback_synack(sk, skb); 2234 break; 2235 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2236 /* connect request refused */ 2237 err = afiucv_hs_callback_synfin(sk, skb); 2238 break; 2239 case (AF_IUCV_FLAG_FIN): 2240 /* close request */ 2241 err = afiucv_hs_callback_fin(sk, skb); 2242 break; 2243 case (AF_IUCV_FLAG_WIN): 2244 err = afiucv_hs_callback_win(sk, skb); 2245 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2246 kfree_skb(skb); 2247 break; 2248 } 2249 /* fall through and receive non-zero length data */ 2250 case (AF_IUCV_FLAG_SHT): 2251 /* shutdown request */ 2252 /* fall through and receive zero length data */ 2253 case 0: 2254 /* plain data frame */ 2255 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2256 err = afiucv_hs_callback_rx(sk, skb); 2257 break; 2258 default: 2259 ; 2260 } 2261 2262 return err; 2263 } 2264 2265 /** 2266 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2267 * transport 2268 **/ 2269 static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2270 enum iucv_tx_notify n) 2271 { 2272 struct sock *isk = skb->sk; 2273 struct sock *sk = NULL; 2274 struct iucv_sock *iucv = NULL; 2275 struct sk_buff_head *list; 2276 struct sk_buff *list_skb; 2277 struct sk_buff *nskb; 2278 unsigned long flags; 2279 2280 read_lock_irqsave(&iucv_sk_list.lock, flags); 2281 sk_for_each(sk, &iucv_sk_list.head) 2282 if (sk == isk) { 2283 iucv = iucv_sk(sk); 2284 break; 2285 } 2286 read_unlock_irqrestore(&iucv_sk_list.lock, flags); 2287 2288 if (!iucv || sock_flag(sk, SOCK_ZAPPED)) 2289 return; 2290 2291 list = &iucv->send_skb_q; 2292 spin_lock_irqsave(&list->lock, flags); 2293 if (skb_queue_empty(list)) 2294 goto out_unlock; 2295 list_skb = list->next; 2296 nskb = list_skb->next; 2297 while (list_skb != (struct sk_buff *)list) { 2298 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2299 switch (n) { 2300 case TX_NOTIFY_OK: 2301 __skb_unlink(list_skb, list); 2302 kfree_skb(list_skb); 2303 iucv_sock_wake_msglim(sk); 2304 break; 2305 case TX_NOTIFY_PENDING: 2306 atomic_inc(&iucv->pendings); 2307 break; 2308 case TX_NOTIFY_DELAYED_OK: 2309 __skb_unlink(list_skb, list); 2310 atomic_dec(&iucv->pendings); 2311 if (atomic_read(&iucv->pendings) <= 0) 2312 iucv_sock_wake_msglim(sk); 2313 kfree_skb(list_skb); 2314 break; 2315 case TX_NOTIFY_UNREACHABLE: 2316 case TX_NOTIFY_DELAYED_UNREACHABLE: 2317 case TX_NOTIFY_TPQFULL: /* not yet used */ 2318 case TX_NOTIFY_GENERALERROR: 2319 case TX_NOTIFY_DELAYED_GENERALERROR: 2320 __skb_unlink(list_skb, list); 2321 kfree_skb(list_skb); 2322 if (sk->sk_state == IUCV_CONNECTED) { 2323 sk->sk_state = IUCV_DISCONN; 2324 sk->sk_state_change(sk); 2325 } 2326 break; 2327 } 2328 break; 2329 } 2330 list_skb = nskb; 2331 nskb = nskb->next; 2332 } 2333 out_unlock: 2334 spin_unlock_irqrestore(&list->lock, flags); 2335 2336 if (sk->sk_state == IUCV_CLOSING) { 2337 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2338 sk->sk_state = IUCV_CLOSED; 2339 sk->sk_state_change(sk); 2340 } 2341 } 2342 2343 } 2344 2345 /* 2346 * afiucv_netdev_event: handle netdev notifier chain events 2347 */ 2348 static int afiucv_netdev_event(struct notifier_block *this, 2349 unsigned long event, void *ptr) 2350 { 2351 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2352 struct sock *sk; 2353 struct iucv_sock *iucv; 2354 2355 switch (event) { 2356 case NETDEV_REBOOT: 2357 case NETDEV_GOING_DOWN: 2358 sk_for_each(sk, &iucv_sk_list.head) { 2359 iucv = iucv_sk(sk); 2360 if ((iucv->hs_dev == event_dev) && 2361 (sk->sk_state == IUCV_CONNECTED)) { 2362 if (event == NETDEV_GOING_DOWN) 2363 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2364 sk->sk_state = IUCV_DISCONN; 2365 sk->sk_state_change(sk); 2366 } 2367 } 2368 break; 2369 case NETDEV_DOWN: 2370 case NETDEV_UNREGISTER: 2371 default: 2372 break; 2373 } 2374 return NOTIFY_DONE; 2375 } 2376 2377 static struct notifier_block afiucv_netdev_notifier = { 2378 .notifier_call = afiucv_netdev_event, 2379 }; 2380 2381 static const struct proto_ops iucv_sock_ops = { 2382 .family = PF_IUCV, 2383 .owner = THIS_MODULE, 2384 .release = iucv_sock_release, 2385 .bind = iucv_sock_bind, 2386 .connect = iucv_sock_connect, 2387 .listen = iucv_sock_listen, 2388 .accept = iucv_sock_accept, 2389 .getname = iucv_sock_getname, 2390 .sendmsg = iucv_sock_sendmsg, 2391 .recvmsg = iucv_sock_recvmsg, 2392 .poll = iucv_sock_poll, 2393 .ioctl = sock_no_ioctl, 2394 .mmap = sock_no_mmap, 2395 .socketpair = sock_no_socketpair, 2396 .shutdown = iucv_sock_shutdown, 2397 .setsockopt = iucv_sock_setsockopt, 2398 .getsockopt = iucv_sock_getsockopt, 2399 }; 2400 2401 static const struct net_proto_family iucv_sock_family_ops = { 2402 .family = AF_IUCV, 2403 .owner = THIS_MODULE, 2404 .create = iucv_sock_create, 2405 }; 2406 2407 static struct packet_type iucv_packet_type = { 2408 .type = cpu_to_be16(ETH_P_AF_IUCV), 2409 .func = afiucv_hs_rcv, 2410 }; 2411 2412 static int afiucv_iucv_init(void) 2413 { 2414 int err; 2415 2416 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2417 if (err) 2418 goto out; 2419 /* establish dummy device */ 2420 af_iucv_driver.bus = pr_iucv->bus; 2421 err = driver_register(&af_iucv_driver); 2422 if (err) 2423 goto out_iucv; 2424 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 2425 if (!af_iucv_dev) { 2426 err = -ENOMEM; 2427 goto out_driver; 2428 } 2429 dev_set_name(af_iucv_dev, "af_iucv"); 2430 af_iucv_dev->bus = pr_iucv->bus; 2431 af_iucv_dev->parent = pr_iucv->root; 2432 af_iucv_dev->release = (void (*)(struct device *))kfree; 2433 af_iucv_dev->driver = &af_iucv_driver; 2434 err = device_register(af_iucv_dev); 2435 if (err) 2436 goto out_driver; 2437 return 0; 2438 2439 out_driver: 2440 driver_unregister(&af_iucv_driver); 2441 out_iucv: 2442 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2443 out: 2444 return err; 2445 } 2446 2447 static int __init afiucv_init(void) 2448 { 2449 int err; 2450 2451 if (MACHINE_IS_VM) { 2452 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2453 if (unlikely(err)) { 2454 WARN_ON(err); 2455 err = -EPROTONOSUPPORT; 2456 goto out; 2457 } 2458 2459 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2460 if (!pr_iucv) { 2461 printk(KERN_WARNING "iucv_if lookup failed\n"); 2462 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2463 } 2464 } else { 2465 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2466 pr_iucv = NULL; 2467 } 2468 2469 err = proto_register(&iucv_proto, 0); 2470 if (err) 2471 goto out; 2472 err = sock_register(&iucv_sock_family_ops); 2473 if (err) 2474 goto out_proto; 2475 2476 if (pr_iucv) { 2477 err = afiucv_iucv_init(); 2478 if (err) 2479 goto out_sock; 2480 } else 2481 register_netdevice_notifier(&afiucv_netdev_notifier); 2482 dev_add_pack(&iucv_packet_type); 2483 return 0; 2484 2485 out_sock: 2486 sock_unregister(PF_IUCV); 2487 out_proto: 2488 proto_unregister(&iucv_proto); 2489 out: 2490 if (pr_iucv) 2491 symbol_put(iucv_if); 2492 return err; 2493 } 2494 2495 static void __exit afiucv_exit(void) 2496 { 2497 if (pr_iucv) { 2498 device_unregister(af_iucv_dev); 2499 driver_unregister(&af_iucv_driver); 2500 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2501 symbol_put(iucv_if); 2502 } else 2503 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2504 dev_remove_pack(&iucv_packet_type); 2505 sock_unregister(PF_IUCV); 2506 proto_unregister(&iucv_proto); 2507 } 2508 2509 module_init(afiucv_init); 2510 module_exit(afiucv_exit); 2511 2512 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2513 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2514 MODULE_VERSION(VERSION); 2515 MODULE_LICENSE("GPL"); 2516 MODULE_ALIAS_NETPROTO(PF_IUCV); 2517 2518