1 /* 2 * IUCV protocol stack for Linux on zSeries 3 * 4 * Copyright IBM Corp. 2006, 2009 5 * 6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> 7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> 8 * PM functions: 9 * Ursula Braun <ursula.braun@de.ibm.com> 10 */ 11 12 #define KMSG_COMPONENT "af_iucv" 13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 14 15 #include <linux/module.h> 16 #include <linux/types.h> 17 #include <linux/list.h> 18 #include <linux/errno.h> 19 #include <linux/kernel.h> 20 #include <linux/sched.h> 21 #include <linux/slab.h> 22 #include <linux/skbuff.h> 23 #include <linux/init.h> 24 #include <linux/poll.h> 25 #include <net/sock.h> 26 #include <asm/ebcdic.h> 27 #include <asm/cpcmd.h> 28 #include <linux/kmod.h> 29 30 #include <net/iucv/af_iucv.h> 31 32 #define VERSION "1.2" 33 34 static char iucv_userid[80]; 35 36 static const struct proto_ops iucv_sock_ops; 37 38 static struct proto iucv_proto = { 39 .name = "AF_IUCV", 40 .owner = THIS_MODULE, 41 .obj_size = sizeof(struct iucv_sock), 42 }; 43 44 static struct iucv_interface *pr_iucv; 45 46 /* special AF_IUCV IPRM messages */ 47 static const u8 iprm_shutdown[8] = 48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 49 50 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) 51 52 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 53 do { \ 54 DEFINE_WAIT(__wait); \ 55 long __timeo = timeo; \ 56 ret = 0; \ 57 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 58 while (!(condition)) { \ 59 if (!__timeo) { \ 60 ret = -EAGAIN; \ 61 break; \ 62 } \ 63 if (signal_pending(current)) { \ 64 ret = sock_intr_errno(__timeo); \ 65 break; \ 66 } \ 67 release_sock(sk); \ 68 __timeo = schedule_timeout(__timeo); \ 69 lock_sock(sk); \ 70 ret = sock_error(sk); \ 71 if (ret) \ 72 break; \ 73 } \ 74 finish_wait(sk_sleep(sk), &__wait); \ 75 } while (0) 76 77 #define iucv_sock_wait(sk, condition, timeo) \ 78 ({ \ 79 int __ret = 0; \ 80 if (!(condition)) \ 81 __iucv_sock_wait(sk, condition, timeo, __ret); \ 82 __ret; \ 83 }) 84 85 static void iucv_sock_kill(struct sock *sk); 86 static void iucv_sock_close(struct sock *sk); 87 static void iucv_sever_path(struct sock *, int); 88 89 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 90 struct packet_type *pt, struct net_device *orig_dev); 91 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 92 struct sk_buff *skb, u8 flags); 93 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); 94 95 /* Call Back functions */ 96 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 97 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 98 static void iucv_callback_connack(struct iucv_path *, u8 *); 99 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *); 100 static void iucv_callback_connrej(struct iucv_path *, u8 *); 101 static void iucv_callback_shutdown(struct iucv_path *, u8 *); 102 103 static struct iucv_sock_list iucv_sk_list = { 104 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 105 .autobind_name = ATOMIC_INIT(0) 106 }; 107 108 static struct iucv_handler af_iucv_handler = { 109 .path_pending = iucv_callback_connreq, 110 .path_complete = iucv_callback_connack, 111 .path_severed = iucv_callback_connrej, 112 .message_pending = iucv_callback_rx, 113 .message_complete = iucv_callback_txdone, 114 .path_quiesced = iucv_callback_shutdown, 115 }; 116 117 static inline void high_nmcpy(unsigned char *dst, char *src) 118 { 119 memcpy(dst, src, 8); 120 } 121 122 static inline void low_nmcpy(unsigned char *dst, char *src) 123 { 124 memcpy(&dst[8], src, 8); 125 } 126 127 static int afiucv_pm_prepare(struct device *dev) 128 { 129 #ifdef CONFIG_PM_DEBUG 130 printk(KERN_WARNING "afiucv_pm_prepare\n"); 131 #endif 132 return 0; 133 } 134 135 static void afiucv_pm_complete(struct device *dev) 136 { 137 #ifdef CONFIG_PM_DEBUG 138 printk(KERN_WARNING "afiucv_pm_complete\n"); 139 #endif 140 } 141 142 /** 143 * afiucv_pm_freeze() - Freeze PM callback 144 * @dev: AFIUCV dummy device 145 * 146 * Sever all established IUCV communication pathes 147 */ 148 static int afiucv_pm_freeze(struct device *dev) 149 { 150 struct iucv_sock *iucv; 151 struct sock *sk; 152 int err = 0; 153 154 #ifdef CONFIG_PM_DEBUG 155 printk(KERN_WARNING "afiucv_pm_freeze\n"); 156 #endif 157 read_lock(&iucv_sk_list.lock); 158 sk_for_each(sk, &iucv_sk_list.head) { 159 iucv = iucv_sk(sk); 160 switch (sk->sk_state) { 161 case IUCV_DISCONN: 162 case IUCV_CLOSING: 163 case IUCV_CONNECTED: 164 iucv_sever_path(sk, 0); 165 break; 166 case IUCV_OPEN: 167 case IUCV_BOUND: 168 case IUCV_LISTEN: 169 case IUCV_CLOSED: 170 default: 171 break; 172 } 173 skb_queue_purge(&iucv->send_skb_q); 174 skb_queue_purge(&iucv->backlog_skb_q); 175 } 176 read_unlock(&iucv_sk_list.lock); 177 return err; 178 } 179 180 /** 181 * afiucv_pm_restore_thaw() - Thaw and restore PM callback 182 * @dev: AFIUCV dummy device 183 * 184 * socket clean up after freeze 185 */ 186 static int afiucv_pm_restore_thaw(struct device *dev) 187 { 188 struct sock *sk; 189 190 #ifdef CONFIG_PM_DEBUG 191 printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); 192 #endif 193 read_lock(&iucv_sk_list.lock); 194 sk_for_each(sk, &iucv_sk_list.head) { 195 switch (sk->sk_state) { 196 case IUCV_CONNECTED: 197 sk->sk_err = EPIPE; 198 sk->sk_state = IUCV_DISCONN; 199 sk->sk_state_change(sk); 200 break; 201 case IUCV_DISCONN: 202 case IUCV_CLOSING: 203 case IUCV_LISTEN: 204 case IUCV_BOUND: 205 case IUCV_OPEN: 206 default: 207 break; 208 } 209 } 210 read_unlock(&iucv_sk_list.lock); 211 return 0; 212 } 213 214 static const struct dev_pm_ops afiucv_pm_ops = { 215 .prepare = afiucv_pm_prepare, 216 .complete = afiucv_pm_complete, 217 .freeze = afiucv_pm_freeze, 218 .thaw = afiucv_pm_restore_thaw, 219 .restore = afiucv_pm_restore_thaw, 220 }; 221 222 static struct device_driver af_iucv_driver = { 223 .owner = THIS_MODULE, 224 .name = "afiucv", 225 .bus = NULL, 226 .pm = &afiucv_pm_ops, 227 }; 228 229 /* dummy device used as trigger for PM functions */ 230 static struct device *af_iucv_dev; 231 232 /** 233 * iucv_msg_length() - Returns the length of an iucv message. 234 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 235 * 236 * The function returns the length of the specified iucv message @msg of data 237 * stored in a buffer and of data stored in the parameter list (PRMDATA). 238 * 239 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 240 * data: 241 * PRMDATA[0..6] socket data (max 7 bytes); 242 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 243 * 244 * The socket data length is computed by subtracting the socket data length 245 * value from 0xFF. 246 * If the socket data len is greater 7, then PRMDATA can be used for special 247 * notifications (see iucv_sock_shutdown); and further, 248 * if the socket data len is > 7, the function returns 8. 249 * 250 * Use this function to allocate socket buffers to store iucv message data. 251 */ 252 static inline size_t iucv_msg_length(struct iucv_message *msg) 253 { 254 size_t datalen; 255 256 if (msg->flags & IUCV_IPRMDATA) { 257 datalen = 0xff - msg->rmmsg[7]; 258 return (datalen < 8) ? datalen : 8; 259 } 260 return msg->length; 261 } 262 263 /** 264 * iucv_sock_in_state() - check for specific states 265 * @sk: sock structure 266 * @state: first iucv sk state 267 * @state: second iucv sk state 268 * 269 * Returns true if the socket in either in the first or second state. 270 */ 271 static int iucv_sock_in_state(struct sock *sk, int state, int state2) 272 { 273 return (sk->sk_state == state || sk->sk_state == state2); 274 } 275 276 /** 277 * iucv_below_msglim() - function to check if messages can be sent 278 * @sk: sock structure 279 * 280 * Returns true if the send queue length is lower than the message limit. 281 * Always returns true if the socket is not connected (no iucv path for 282 * checking the message limit). 283 */ 284 static inline int iucv_below_msglim(struct sock *sk) 285 { 286 struct iucv_sock *iucv = iucv_sk(sk); 287 288 if (sk->sk_state != IUCV_CONNECTED) 289 return 1; 290 if (iucv->transport == AF_IUCV_TRANS_IUCV) 291 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); 292 else 293 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 294 (atomic_read(&iucv->pendings) <= 0)); 295 } 296 297 /** 298 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 299 */ 300 static void iucv_sock_wake_msglim(struct sock *sk) 301 { 302 struct socket_wq *wq; 303 304 rcu_read_lock(); 305 wq = rcu_dereference(sk->sk_wq); 306 if (wq_has_sleeper(wq)) 307 wake_up_interruptible_all(&wq->wait); 308 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 309 rcu_read_unlock(); 310 } 311 312 /** 313 * afiucv_hs_send() - send a message through HiperSockets transport 314 */ 315 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 316 struct sk_buff *skb, u8 flags) 317 { 318 struct iucv_sock *iucv = iucv_sk(sock); 319 struct af_iucv_trans_hdr *phs_hdr; 320 struct sk_buff *nskb; 321 int err, confirm_recv = 0; 322 323 memset(skb->head, 0, ETH_HLEN); 324 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, 325 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 = 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(atomic_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 FIN 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; 461 462 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 463 skb = sock_alloc_send_skb(sk, blen, 1, &err); 464 if (skb) { 465 skb_reserve(skb, blen); 466 err = afiucv_hs_send(NULL, sk, skb, flags); 467 } 468 return err; 469 } 470 471 /* Close an IUCV socket */ 472 static void iucv_sock_close(struct sock *sk) 473 { 474 struct iucv_sock *iucv = iucv_sk(sk); 475 unsigned long timeo; 476 int err = 0; 477 478 lock_sock(sk); 479 480 switch (sk->sk_state) { 481 case IUCV_LISTEN: 482 iucv_sock_cleanup_listen(sk); 483 break; 484 485 case IUCV_CONNECTED: 486 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 487 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 488 sk->sk_state = IUCV_DISCONN; 489 sk->sk_state_change(sk); 490 } 491 case IUCV_DISCONN: /* fall through */ 492 sk->sk_state = IUCV_CLOSING; 493 sk->sk_state_change(sk); 494 495 if (!err && !skb_queue_empty(&iucv->send_skb_q)) { 496 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 497 timeo = sk->sk_lingertime; 498 else 499 timeo = IUCV_DISCONN_TIMEOUT; 500 iucv_sock_wait(sk, 501 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 502 timeo); 503 } 504 505 case IUCV_CLOSING: /* fall through */ 506 sk->sk_state = IUCV_CLOSED; 507 sk->sk_state_change(sk); 508 509 sk->sk_err = ECONNRESET; 510 sk->sk_state_change(sk); 511 512 skb_queue_purge(&iucv->send_skb_q); 513 skb_queue_purge(&iucv->backlog_skb_q); 514 515 default: /* fall through */ 516 iucv_sever_path(sk, 1); 517 } 518 519 if (iucv->hs_dev) { 520 dev_put(iucv->hs_dev); 521 iucv->hs_dev = NULL; 522 sk->sk_bound_dev_if = 0; 523 } 524 525 /* mark socket for deletion by iucv_sock_kill() */ 526 sock_set_flag(sk, SOCK_ZAPPED); 527 528 release_sock(sk); 529 } 530 531 static void iucv_sock_init(struct sock *sk, struct sock *parent) 532 { 533 if (parent) 534 sk->sk_type = parent->sk_type; 535 } 536 537 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 538 { 539 struct sock *sk; 540 struct iucv_sock *iucv; 541 542 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 543 if (!sk) 544 return NULL; 545 iucv = iucv_sk(sk); 546 547 sock_init_data(sock, sk); 548 INIT_LIST_HEAD(&iucv->accept_q); 549 spin_lock_init(&iucv->accept_q_lock); 550 skb_queue_head_init(&iucv->send_skb_q); 551 INIT_LIST_HEAD(&iucv->message_q.list); 552 spin_lock_init(&iucv->message_q.lock); 553 skb_queue_head_init(&iucv->backlog_skb_q); 554 iucv->send_tag = 0; 555 atomic_set(&iucv->pendings, 0); 556 iucv->flags = 0; 557 iucv->msglimit = 0; 558 atomic_set(&iucv->msg_sent, 0); 559 atomic_set(&iucv->msg_recv, 0); 560 iucv->path = NULL; 561 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 562 memset(&iucv->src_user_id , 0, 32); 563 if (pr_iucv) 564 iucv->transport = AF_IUCV_TRANS_IUCV; 565 else 566 iucv->transport = AF_IUCV_TRANS_HIPER; 567 568 sk->sk_destruct = iucv_sock_destruct; 569 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 570 sk->sk_allocation = GFP_DMA; 571 572 sock_reset_flag(sk, SOCK_ZAPPED); 573 574 sk->sk_protocol = proto; 575 sk->sk_state = IUCV_OPEN; 576 577 iucv_sock_link(&iucv_sk_list, sk); 578 return sk; 579 } 580 581 /* Create an IUCV socket */ 582 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 583 int kern) 584 { 585 struct sock *sk; 586 587 if (protocol && protocol != PF_IUCV) 588 return -EPROTONOSUPPORT; 589 590 sock->state = SS_UNCONNECTED; 591 592 switch (sock->type) { 593 case SOCK_STREAM: 594 sock->ops = &iucv_sock_ops; 595 break; 596 case SOCK_SEQPACKET: 597 /* currently, proto ops can handle both sk types */ 598 sock->ops = &iucv_sock_ops; 599 break; 600 default: 601 return -ESOCKTNOSUPPORT; 602 } 603 604 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 605 if (!sk) 606 return -ENOMEM; 607 608 iucv_sock_init(sk, NULL); 609 610 return 0; 611 } 612 613 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 614 { 615 write_lock_bh(&l->lock); 616 sk_add_node(sk, &l->head); 617 write_unlock_bh(&l->lock); 618 } 619 620 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 621 { 622 write_lock_bh(&l->lock); 623 sk_del_node_init(sk); 624 write_unlock_bh(&l->lock); 625 } 626 627 void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 628 { 629 unsigned long flags; 630 struct iucv_sock *par = iucv_sk(parent); 631 632 sock_hold(sk); 633 spin_lock_irqsave(&par->accept_q_lock, flags); 634 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 635 spin_unlock_irqrestore(&par->accept_q_lock, flags); 636 iucv_sk(sk)->parent = parent; 637 sk_acceptq_added(parent); 638 } 639 640 void iucv_accept_unlink(struct sock *sk) 641 { 642 unsigned long flags; 643 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 644 645 spin_lock_irqsave(&par->accept_q_lock, flags); 646 list_del_init(&iucv_sk(sk)->accept_q); 647 spin_unlock_irqrestore(&par->accept_q_lock, flags); 648 sk_acceptq_removed(iucv_sk(sk)->parent); 649 iucv_sk(sk)->parent = NULL; 650 sock_put(sk); 651 } 652 653 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 654 { 655 struct iucv_sock *isk, *n; 656 struct sock *sk; 657 658 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 659 sk = (struct sock *) isk; 660 lock_sock(sk); 661 662 if (sk->sk_state == IUCV_CLOSED) { 663 iucv_accept_unlink(sk); 664 release_sock(sk); 665 continue; 666 } 667 668 if (sk->sk_state == IUCV_CONNECTED || 669 sk->sk_state == IUCV_DISCONN || 670 !newsock) { 671 iucv_accept_unlink(sk); 672 if (newsock) 673 sock_graft(sk, newsock); 674 675 release_sock(sk); 676 return sk; 677 } 678 679 release_sock(sk); 680 } 681 return NULL; 682 } 683 684 static void __iucv_auto_name(struct iucv_sock *iucv) 685 { 686 char name[12]; 687 688 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 689 while (__iucv_get_sock_by_name(name)) { 690 sprintf(name, "%08x", 691 atomic_inc_return(&iucv_sk_list.autobind_name)); 692 } 693 memcpy(iucv->src_name, name, 8); 694 } 695 696 /* Bind an unbound socket */ 697 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 698 int addr_len) 699 { 700 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 701 struct sock *sk = sock->sk; 702 struct iucv_sock *iucv; 703 int err = 0; 704 struct net_device *dev; 705 char uid[9]; 706 707 /* Verify the input sockaddr */ 708 if (!addr || addr->sa_family != AF_IUCV) 709 return -EINVAL; 710 711 lock_sock(sk); 712 if (sk->sk_state != IUCV_OPEN) { 713 err = -EBADFD; 714 goto done; 715 } 716 717 write_lock_bh(&iucv_sk_list.lock); 718 719 iucv = iucv_sk(sk); 720 if (__iucv_get_sock_by_name(sa->siucv_name)) { 721 err = -EADDRINUSE; 722 goto done_unlock; 723 } 724 if (iucv->path) 725 goto done_unlock; 726 727 /* Bind the socket */ 728 if (pr_iucv) 729 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 730 goto vm_bind; /* VM IUCV transport */ 731 732 /* try hiper transport */ 733 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 734 ASCEBC(uid, 8); 735 rcu_read_lock(); 736 for_each_netdev_rcu(&init_net, dev) { 737 if (!memcmp(dev->perm_addr, uid, 8)) { 738 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 739 /* Check for unitialized siucv_name */ 740 if (strncmp(sa->siucv_name, " ", 8) == 0) 741 __iucv_auto_name(iucv); 742 else 743 memcpy(iucv->src_name, sa->siucv_name, 8); 744 sk->sk_bound_dev_if = dev->ifindex; 745 iucv->hs_dev = dev; 746 dev_hold(dev); 747 sk->sk_state = IUCV_BOUND; 748 iucv->transport = AF_IUCV_TRANS_HIPER; 749 if (!iucv->msglimit) 750 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 751 rcu_read_unlock(); 752 goto done_unlock; 753 } 754 } 755 rcu_read_unlock(); 756 vm_bind: 757 if (pr_iucv) { 758 /* use local userid for backward compat */ 759 memcpy(iucv->src_name, sa->siucv_name, 8); 760 memcpy(iucv->src_user_id, iucv_userid, 8); 761 sk->sk_state = IUCV_BOUND; 762 iucv->transport = AF_IUCV_TRANS_IUCV; 763 if (!iucv->msglimit) 764 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 765 goto done_unlock; 766 } 767 /* found no dev to bind */ 768 err = -ENODEV; 769 done_unlock: 770 /* Release the socket list lock */ 771 write_unlock_bh(&iucv_sk_list.lock); 772 done: 773 release_sock(sk); 774 return err; 775 } 776 777 /* Automatically bind an unbound socket */ 778 static int iucv_sock_autobind(struct sock *sk) 779 { 780 struct iucv_sock *iucv = iucv_sk(sk); 781 int err = 0; 782 783 if (unlikely(!pr_iucv)) 784 return -EPROTO; 785 786 memcpy(iucv->src_user_id, iucv_userid, 8); 787 788 write_lock_bh(&iucv_sk_list.lock); 789 __iucv_auto_name(iucv); 790 write_unlock_bh(&iucv_sk_list.lock); 791 792 if (!iucv->msglimit) 793 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 794 795 return err; 796 } 797 798 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 799 { 800 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 801 struct sock *sk = sock->sk; 802 struct iucv_sock *iucv = iucv_sk(sk); 803 unsigned char user_data[16]; 804 int err; 805 806 high_nmcpy(user_data, sa->siucv_name); 807 low_nmcpy(user_data, iucv->src_name); 808 ASCEBC(user_data, sizeof(user_data)); 809 810 /* Create path. */ 811 iucv->path = iucv_path_alloc(iucv->msglimit, 812 IUCV_IPRMDATA, GFP_KERNEL); 813 if (!iucv->path) { 814 err = -ENOMEM; 815 goto done; 816 } 817 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 818 sa->siucv_user_id, NULL, user_data, 819 sk); 820 if (err) { 821 iucv_path_free(iucv->path); 822 iucv->path = NULL; 823 switch (err) { 824 case 0x0b: /* Target communicator is not logged on */ 825 err = -ENETUNREACH; 826 break; 827 case 0x0d: /* Max connections for this guest exceeded */ 828 case 0x0e: /* Max connections for target guest exceeded */ 829 err = -EAGAIN; 830 break; 831 case 0x0f: /* Missing IUCV authorization */ 832 err = -EACCES; 833 break; 834 default: 835 err = -ECONNREFUSED; 836 break; 837 } 838 } 839 done: 840 return err; 841 } 842 843 /* Connect an unconnected socket */ 844 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 845 int alen, int flags) 846 { 847 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 848 struct sock *sk = sock->sk; 849 struct iucv_sock *iucv = iucv_sk(sk); 850 int err; 851 852 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) 853 return -EINVAL; 854 855 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 856 return -EBADFD; 857 858 if (sk->sk_state == IUCV_OPEN && 859 iucv->transport == AF_IUCV_TRANS_HIPER) 860 return -EBADFD; /* explicit bind required */ 861 862 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 863 return -EINVAL; 864 865 if (sk->sk_state == IUCV_OPEN) { 866 err = iucv_sock_autobind(sk); 867 if (unlikely(err)) 868 return err; 869 } 870 871 lock_sock(sk); 872 873 /* Set the destination information */ 874 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 875 memcpy(iucv->dst_name, sa->siucv_name, 8); 876 877 if (iucv->transport == AF_IUCV_TRANS_HIPER) 878 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 879 else 880 err = afiucv_path_connect(sock, addr); 881 if (err) 882 goto done; 883 884 if (sk->sk_state != IUCV_CONNECTED) 885 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 886 IUCV_DISCONN), 887 sock_sndtimeo(sk, flags & O_NONBLOCK)); 888 889 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 890 err = -ECONNREFUSED; 891 892 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 893 iucv_sever_path(sk, 0); 894 895 done: 896 release_sock(sk); 897 return err; 898 } 899 900 /* Move a socket into listening state. */ 901 static int iucv_sock_listen(struct socket *sock, int backlog) 902 { 903 struct sock *sk = sock->sk; 904 int err; 905 906 lock_sock(sk); 907 908 err = -EINVAL; 909 if (sk->sk_state != IUCV_BOUND) 910 goto done; 911 912 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 913 goto done; 914 915 sk->sk_max_ack_backlog = backlog; 916 sk->sk_ack_backlog = 0; 917 sk->sk_state = IUCV_LISTEN; 918 err = 0; 919 920 done: 921 release_sock(sk); 922 return err; 923 } 924 925 /* Accept a pending connection */ 926 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 927 int flags) 928 { 929 DECLARE_WAITQUEUE(wait, current); 930 struct sock *sk = sock->sk, *nsk; 931 long timeo; 932 int err = 0; 933 934 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 935 936 if (sk->sk_state != IUCV_LISTEN) { 937 err = -EBADFD; 938 goto done; 939 } 940 941 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 942 943 /* Wait for an incoming connection */ 944 add_wait_queue_exclusive(sk_sleep(sk), &wait); 945 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 946 set_current_state(TASK_INTERRUPTIBLE); 947 if (!timeo) { 948 err = -EAGAIN; 949 break; 950 } 951 952 release_sock(sk); 953 timeo = schedule_timeout(timeo); 954 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 955 956 if (sk->sk_state != IUCV_LISTEN) { 957 err = -EBADFD; 958 break; 959 } 960 961 if (signal_pending(current)) { 962 err = sock_intr_errno(timeo); 963 break; 964 } 965 } 966 967 set_current_state(TASK_RUNNING); 968 remove_wait_queue(sk_sleep(sk), &wait); 969 970 if (err) 971 goto done; 972 973 newsock->state = SS_CONNECTED; 974 975 done: 976 release_sock(sk); 977 return err; 978 } 979 980 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 981 int *len, int peer) 982 { 983 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 984 struct sock *sk = sock->sk; 985 struct iucv_sock *iucv = iucv_sk(sk); 986 987 addr->sa_family = AF_IUCV; 988 *len = sizeof(struct sockaddr_iucv); 989 990 if (peer) { 991 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 992 memcpy(siucv->siucv_name, iucv->dst_name, 8); 993 } else { 994 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 995 memcpy(siucv->siucv_name, iucv->src_name, 8); 996 } 997 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 998 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 999 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 1000 1001 return 0; 1002 } 1003 1004 /** 1005 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 1006 * @path: IUCV path 1007 * @msg: Pointer to a struct iucv_message 1008 * @skb: The socket data to send, skb->len MUST BE <= 7 1009 * 1010 * Send the socket data in the parameter list in the iucv message 1011 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 1012 * list and the socket data len at index 7 (last byte). 1013 * See also iucv_msg_length(). 1014 * 1015 * Returns the error code from the iucv_message_send() call. 1016 */ 1017 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 1018 struct sk_buff *skb) 1019 { 1020 u8 prmdata[8]; 1021 1022 memcpy(prmdata, (void *) skb->data, skb->len); 1023 prmdata[7] = 0xff - (u8) skb->len; 1024 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 1025 (void *) prmdata, 8); 1026 } 1027 1028 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 1029 size_t len) 1030 { 1031 struct sock *sk = sock->sk; 1032 struct iucv_sock *iucv = iucv_sk(sk); 1033 struct sk_buff *skb; 1034 struct iucv_message txmsg; 1035 struct cmsghdr *cmsg; 1036 int cmsg_done; 1037 long timeo; 1038 char user_id[9]; 1039 char appl_id[9]; 1040 int err; 1041 int noblock = msg->msg_flags & MSG_DONTWAIT; 1042 1043 err = sock_error(sk); 1044 if (err) 1045 return err; 1046 1047 if (msg->msg_flags & MSG_OOB) 1048 return -EOPNOTSUPP; 1049 1050 /* SOCK_SEQPACKET: we do not support segmented records */ 1051 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 1052 return -EOPNOTSUPP; 1053 1054 lock_sock(sk); 1055 1056 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1057 err = -EPIPE; 1058 goto out; 1059 } 1060 1061 /* Return if the socket is not in connected state */ 1062 if (sk->sk_state != IUCV_CONNECTED) { 1063 err = -ENOTCONN; 1064 goto out; 1065 } 1066 1067 /* initialize defaults */ 1068 cmsg_done = 0; /* check for duplicate headers */ 1069 txmsg.class = 0; 1070 1071 /* iterate over control messages */ 1072 for_each_cmsghdr(cmsg, msg) { 1073 if (!CMSG_OK(msg, cmsg)) { 1074 err = -EINVAL; 1075 goto out; 1076 } 1077 1078 if (cmsg->cmsg_level != SOL_IUCV) 1079 continue; 1080 1081 if (cmsg->cmsg_type & cmsg_done) { 1082 err = -EINVAL; 1083 goto out; 1084 } 1085 cmsg_done |= cmsg->cmsg_type; 1086 1087 switch (cmsg->cmsg_type) { 1088 case SCM_IUCV_TRGCLS: 1089 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 1090 err = -EINVAL; 1091 goto out; 1092 } 1093 1094 /* set iucv message target class */ 1095 memcpy(&txmsg.class, 1096 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 1097 1098 break; 1099 1100 default: 1101 err = -EINVAL; 1102 goto out; 1103 } 1104 } 1105 1106 /* allocate one skb for each iucv message: 1107 * this is fine for SOCK_SEQPACKET (unless we want to support 1108 * segmented records using the MSG_EOR flag), but 1109 * for SOCK_STREAM we might want to improve it in future */ 1110 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1111 skb = sock_alloc_send_skb(sk, 1112 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, 1113 noblock, &err); 1114 else 1115 skb = sock_alloc_send_skb(sk, len, noblock, &err); 1116 if (!skb) 1117 goto out; 1118 if (iucv->transport == AF_IUCV_TRANS_HIPER) 1119 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); 1120 if (memcpy_from_msg(skb_put(skb, len), msg, len)) { 1121 err = -EFAULT; 1122 goto fail; 1123 } 1124 1125 /* wait if outstanding messages for iucv path has reached */ 1126 timeo = sock_sndtimeo(sk, noblock); 1127 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1128 if (err) 1129 goto fail; 1130 1131 /* return -ECONNRESET if the socket is no longer connected */ 1132 if (sk->sk_state != IUCV_CONNECTED) { 1133 err = -ECONNRESET; 1134 goto fail; 1135 } 1136 1137 /* increment and save iucv message tag for msg_completion cbk */ 1138 txmsg.tag = iucv->send_tag++; 1139 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1140 1141 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1142 atomic_inc(&iucv->msg_sent); 1143 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1144 if (err) { 1145 atomic_dec(&iucv->msg_sent); 1146 goto fail; 1147 } 1148 goto release; 1149 } 1150 skb_queue_tail(&iucv->send_skb_q, skb); 1151 1152 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) 1153 && skb->len <= 7) { 1154 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1155 1156 /* on success: there is no message_complete callback 1157 * for an IPRMDATA msg; remove skb from send queue */ 1158 if (err == 0) { 1159 skb_unlink(skb, &iucv->send_skb_q); 1160 kfree_skb(skb); 1161 } 1162 1163 /* this error should never happen since the 1164 * IUCV_IPRMDATA path flag is set... sever path */ 1165 if (err == 0x15) { 1166 pr_iucv->path_sever(iucv->path, NULL); 1167 skb_unlink(skb, &iucv->send_skb_q); 1168 err = -EPIPE; 1169 goto fail; 1170 } 1171 } else 1172 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, 1173 (void *) skb->data, skb->len); 1174 if (err) { 1175 if (err == 3) { 1176 user_id[8] = 0; 1177 memcpy(user_id, iucv->dst_user_id, 8); 1178 appl_id[8] = 0; 1179 memcpy(appl_id, iucv->dst_name, 8); 1180 pr_err("Application %s on z/VM guest %s" 1181 " exceeds message limit\n", 1182 appl_id, user_id); 1183 err = -EAGAIN; 1184 } else 1185 err = -EPIPE; 1186 skb_unlink(skb, &iucv->send_skb_q); 1187 goto fail; 1188 } 1189 1190 release: 1191 release_sock(sk); 1192 return len; 1193 1194 fail: 1195 kfree_skb(skb); 1196 out: 1197 release_sock(sk); 1198 return err; 1199 } 1200 1201 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's 1202 * 1203 * Locking: must be called with message_q.lock held 1204 */ 1205 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) 1206 { 1207 int dataleft, size, copied = 0; 1208 struct sk_buff *nskb; 1209 1210 dataleft = len; 1211 while (dataleft) { 1212 if (dataleft >= sk->sk_rcvbuf / 4) 1213 size = sk->sk_rcvbuf / 4; 1214 else 1215 size = dataleft; 1216 1217 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); 1218 if (!nskb) 1219 return -ENOMEM; 1220 1221 /* copy target class to control buffer of new skb */ 1222 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class; 1223 1224 /* copy data fragment */ 1225 memcpy(nskb->data, skb->data + copied, size); 1226 copied += size; 1227 dataleft -= size; 1228 1229 skb_reset_transport_header(nskb); 1230 skb_reset_network_header(nskb); 1231 nskb->len = size; 1232 1233 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); 1234 } 1235 1236 return 0; 1237 } 1238 1239 /* iucv_process_message() - Receive a single outstanding IUCV message 1240 * 1241 * Locking: must be called with message_q.lock held 1242 */ 1243 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1244 struct iucv_path *path, 1245 struct iucv_message *msg) 1246 { 1247 int rc; 1248 unsigned int len; 1249 1250 len = iucv_msg_length(msg); 1251 1252 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1253 /* Note: the first 4 bytes are reserved for msg tag */ 1254 IUCV_SKB_CB(skb)->class = msg->class; 1255 1256 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1257 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1258 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1259 skb->data = NULL; 1260 skb->len = 0; 1261 } 1262 } else { 1263 rc = pr_iucv->message_receive(path, msg, 1264 msg->flags & IUCV_IPRMDATA, 1265 skb->data, len, NULL); 1266 if (rc) { 1267 kfree_skb(skb); 1268 return; 1269 } 1270 /* we need to fragment iucv messages for SOCK_STREAM only; 1271 * for SOCK_SEQPACKET, it is only relevant if we support 1272 * record segmentation using MSG_EOR (see also recvmsg()) */ 1273 if (sk->sk_type == SOCK_STREAM && 1274 skb->truesize >= sk->sk_rcvbuf / 4) { 1275 rc = iucv_fragment_skb(sk, skb, len); 1276 kfree_skb(skb); 1277 skb = NULL; 1278 if (rc) { 1279 pr_iucv->path_sever(path, NULL); 1280 return; 1281 } 1282 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); 1283 } else { 1284 skb_reset_transport_header(skb); 1285 skb_reset_network_header(skb); 1286 skb->len = len; 1287 } 1288 } 1289 1290 IUCV_SKB_CB(skb)->offset = 0; 1291 if (sock_queue_rcv_skb(sk, skb)) 1292 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); 1293 } 1294 1295 /* iucv_process_message_q() - Process outstanding IUCV messages 1296 * 1297 * Locking: must be called with message_q.lock held 1298 */ 1299 static void iucv_process_message_q(struct sock *sk) 1300 { 1301 struct iucv_sock *iucv = iucv_sk(sk); 1302 struct sk_buff *skb; 1303 struct sock_msg_q *p, *n; 1304 1305 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1306 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); 1307 if (!skb) 1308 break; 1309 iucv_process_message(sk, skb, p->path, &p->msg); 1310 list_del(&p->list); 1311 kfree(p); 1312 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1313 break; 1314 } 1315 } 1316 1317 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1318 size_t len, int flags) 1319 { 1320 int noblock = flags & MSG_DONTWAIT; 1321 struct sock *sk = sock->sk; 1322 struct iucv_sock *iucv = iucv_sk(sk); 1323 unsigned int copied, rlen; 1324 struct sk_buff *skb, *rskb, *cskb; 1325 int err = 0; 1326 u32 offset; 1327 1328 if ((sk->sk_state == IUCV_DISCONN) && 1329 skb_queue_empty(&iucv->backlog_skb_q) && 1330 skb_queue_empty(&sk->sk_receive_queue) && 1331 list_empty(&iucv->message_q.list)) 1332 return 0; 1333 1334 if (flags & (MSG_OOB)) 1335 return -EOPNOTSUPP; 1336 1337 /* receive/dequeue next skb: 1338 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1339 skb = skb_recv_datagram(sk, flags, noblock, &err); 1340 if (!skb) { 1341 if (sk->sk_shutdown & RCV_SHUTDOWN) 1342 return 0; 1343 return err; 1344 } 1345 1346 offset = IUCV_SKB_CB(skb)->offset; 1347 rlen = skb->len - offset; /* real length of skb */ 1348 copied = min_t(unsigned int, rlen, len); 1349 if (!rlen) 1350 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1351 1352 cskb = skb; 1353 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1354 if (!(flags & MSG_PEEK)) 1355 skb_queue_head(&sk->sk_receive_queue, skb); 1356 return -EFAULT; 1357 } 1358 1359 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1360 if (sk->sk_type == SOCK_SEQPACKET) { 1361 if (copied < rlen) 1362 msg->msg_flags |= MSG_TRUNC; 1363 /* each iucv message contains a complete record */ 1364 msg->msg_flags |= MSG_EOR; 1365 } 1366 1367 /* create control message to store iucv msg target class: 1368 * get the trgcls from the control buffer of the skb due to 1369 * fragmentation of original iucv message. */ 1370 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1371 sizeof(IUCV_SKB_CB(skb)->class), 1372 (void *)&IUCV_SKB_CB(skb)->class); 1373 if (err) { 1374 if (!(flags & MSG_PEEK)) 1375 skb_queue_head(&sk->sk_receive_queue, skb); 1376 return err; 1377 } 1378 1379 /* Mark read part of skb as used */ 1380 if (!(flags & MSG_PEEK)) { 1381 1382 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1383 if (sk->sk_type == SOCK_STREAM) { 1384 if (copied < rlen) { 1385 IUCV_SKB_CB(skb)->offset = offset + copied; 1386 skb_queue_head(&sk->sk_receive_queue, skb); 1387 goto done; 1388 } 1389 } 1390 1391 kfree_skb(skb); 1392 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1393 atomic_inc(&iucv->msg_recv); 1394 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1395 WARN_ON(1); 1396 iucv_sock_close(sk); 1397 return -EFAULT; 1398 } 1399 } 1400 1401 /* Queue backlog skbs */ 1402 spin_lock_bh(&iucv->message_q.lock); 1403 rskb = skb_dequeue(&iucv->backlog_skb_q); 1404 while (rskb) { 1405 IUCV_SKB_CB(rskb)->offset = 0; 1406 if (sock_queue_rcv_skb(sk, rskb)) { 1407 skb_queue_head(&iucv->backlog_skb_q, 1408 rskb); 1409 break; 1410 } else { 1411 rskb = skb_dequeue(&iucv->backlog_skb_q); 1412 } 1413 } 1414 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1415 if (!list_empty(&iucv->message_q.list)) 1416 iucv_process_message_q(sk); 1417 if (atomic_read(&iucv->msg_recv) >= 1418 iucv->msglimit / 2) { 1419 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1420 if (err) { 1421 sk->sk_state = IUCV_DISCONN; 1422 sk->sk_state_change(sk); 1423 } 1424 } 1425 } 1426 spin_unlock_bh(&iucv->message_q.lock); 1427 } 1428 1429 done: 1430 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1431 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1432 copied = rlen; 1433 1434 return copied; 1435 } 1436 1437 static inline unsigned int iucv_accept_poll(struct sock *parent) 1438 { 1439 struct iucv_sock *isk, *n; 1440 struct sock *sk; 1441 1442 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1443 sk = (struct sock *) isk; 1444 1445 if (sk->sk_state == IUCV_CONNECTED) 1446 return POLLIN | POLLRDNORM; 1447 } 1448 1449 return 0; 1450 } 1451 1452 unsigned int iucv_sock_poll(struct file *file, struct socket *sock, 1453 poll_table *wait) 1454 { 1455 struct sock *sk = sock->sk; 1456 unsigned int mask = 0; 1457 1458 sock_poll_wait(file, sk_sleep(sk), wait); 1459 1460 if (sk->sk_state == IUCV_LISTEN) 1461 return iucv_accept_poll(sk); 1462 1463 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1464 mask |= POLLERR | 1465 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); 1466 1467 if (sk->sk_shutdown & RCV_SHUTDOWN) 1468 mask |= POLLRDHUP; 1469 1470 if (sk->sk_shutdown == SHUTDOWN_MASK) 1471 mask |= POLLHUP; 1472 1473 if (!skb_queue_empty(&sk->sk_receive_queue) || 1474 (sk->sk_shutdown & RCV_SHUTDOWN)) 1475 mask |= POLLIN | POLLRDNORM; 1476 1477 if (sk->sk_state == IUCV_CLOSED) 1478 mask |= POLLHUP; 1479 1480 if (sk->sk_state == IUCV_DISCONN) 1481 mask |= POLLIN; 1482 1483 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1484 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 1485 else 1486 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1487 1488 return mask; 1489 } 1490 1491 static int iucv_sock_shutdown(struct socket *sock, int how) 1492 { 1493 struct sock *sk = sock->sk; 1494 struct iucv_sock *iucv = iucv_sk(sk); 1495 struct iucv_message txmsg; 1496 int err = 0; 1497 1498 how++; 1499 1500 if ((how & ~SHUTDOWN_MASK) || !how) 1501 return -EINVAL; 1502 1503 lock_sock(sk); 1504 switch (sk->sk_state) { 1505 case IUCV_LISTEN: 1506 case IUCV_DISCONN: 1507 case IUCV_CLOSING: 1508 case IUCV_CLOSED: 1509 err = -ENOTCONN; 1510 goto fail; 1511 default: 1512 break; 1513 } 1514 1515 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1516 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1517 txmsg.class = 0; 1518 txmsg.tag = 0; 1519 err = pr_iucv->message_send(iucv->path, &txmsg, 1520 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1521 if (err) { 1522 switch (err) { 1523 case 1: 1524 err = -ENOTCONN; 1525 break; 1526 case 2: 1527 err = -ECONNRESET; 1528 break; 1529 default: 1530 err = -ENOTCONN; 1531 break; 1532 } 1533 } 1534 } else 1535 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1536 } 1537 1538 sk->sk_shutdown |= how; 1539 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1540 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1541 iucv->path) { 1542 err = pr_iucv->path_quiesce(iucv->path, NULL); 1543 if (err) 1544 err = -ENOTCONN; 1545 /* skb_queue_purge(&sk->sk_receive_queue); */ 1546 } 1547 skb_queue_purge(&sk->sk_receive_queue); 1548 } 1549 1550 /* Wake up anyone sleeping in poll */ 1551 sk->sk_state_change(sk); 1552 1553 fail: 1554 release_sock(sk); 1555 return err; 1556 } 1557 1558 static int iucv_sock_release(struct socket *sock) 1559 { 1560 struct sock *sk = sock->sk; 1561 int err = 0; 1562 1563 if (!sk) 1564 return 0; 1565 1566 iucv_sock_close(sk); 1567 1568 sock_orphan(sk); 1569 iucv_sock_kill(sk); 1570 return err; 1571 } 1572 1573 /* getsockopt and setsockopt */ 1574 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1575 char __user *optval, unsigned int optlen) 1576 { 1577 struct sock *sk = sock->sk; 1578 struct iucv_sock *iucv = iucv_sk(sk); 1579 int val; 1580 int rc; 1581 1582 if (level != SOL_IUCV) 1583 return -ENOPROTOOPT; 1584 1585 if (optlen < sizeof(int)) 1586 return -EINVAL; 1587 1588 if (get_user(val, (int __user *) optval)) 1589 return -EFAULT; 1590 1591 rc = 0; 1592 1593 lock_sock(sk); 1594 switch (optname) { 1595 case SO_IPRMDATA_MSG: 1596 if (val) 1597 iucv->flags |= IUCV_IPRMDATA; 1598 else 1599 iucv->flags &= ~IUCV_IPRMDATA; 1600 break; 1601 case SO_MSGLIMIT: 1602 switch (sk->sk_state) { 1603 case IUCV_OPEN: 1604 case IUCV_BOUND: 1605 if (val < 1 || val > (u16)(~0)) 1606 rc = -EINVAL; 1607 else 1608 iucv->msglimit = val; 1609 break; 1610 default: 1611 rc = -EINVAL; 1612 break; 1613 } 1614 break; 1615 default: 1616 rc = -ENOPROTOOPT; 1617 break; 1618 } 1619 release_sock(sk); 1620 1621 return rc; 1622 } 1623 1624 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1625 char __user *optval, int __user *optlen) 1626 { 1627 struct sock *sk = sock->sk; 1628 struct iucv_sock *iucv = iucv_sk(sk); 1629 unsigned int val; 1630 int len; 1631 1632 if (level != SOL_IUCV) 1633 return -ENOPROTOOPT; 1634 1635 if (get_user(len, optlen)) 1636 return -EFAULT; 1637 1638 if (len < 0) 1639 return -EINVAL; 1640 1641 len = min_t(unsigned int, len, sizeof(int)); 1642 1643 switch (optname) { 1644 case SO_IPRMDATA_MSG: 1645 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1646 break; 1647 case SO_MSGLIMIT: 1648 lock_sock(sk); 1649 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1650 : iucv->msglimit; /* default */ 1651 release_sock(sk); 1652 break; 1653 case SO_MSGSIZE: 1654 if (sk->sk_state == IUCV_OPEN) 1655 return -EBADFD; 1656 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1657 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1658 0x7fffffff; 1659 break; 1660 default: 1661 return -ENOPROTOOPT; 1662 } 1663 1664 if (put_user(len, optlen)) 1665 return -EFAULT; 1666 if (copy_to_user(optval, &val, len)) 1667 return -EFAULT; 1668 1669 return 0; 1670 } 1671 1672 1673 /* Callback wrappers - called from iucv base support */ 1674 static int iucv_callback_connreq(struct iucv_path *path, 1675 u8 ipvmid[8], u8 ipuser[16]) 1676 { 1677 unsigned char user_data[16]; 1678 unsigned char nuser_data[16]; 1679 unsigned char src_name[8]; 1680 struct sock *sk, *nsk; 1681 struct iucv_sock *iucv, *niucv; 1682 int err; 1683 1684 memcpy(src_name, ipuser, 8); 1685 EBCASC(src_name, 8); 1686 /* Find out if this path belongs to af_iucv. */ 1687 read_lock(&iucv_sk_list.lock); 1688 iucv = NULL; 1689 sk = NULL; 1690 sk_for_each(sk, &iucv_sk_list.head) 1691 if (sk->sk_state == IUCV_LISTEN && 1692 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1693 /* 1694 * Found a listening socket with 1695 * src_name == ipuser[0-7]. 1696 */ 1697 iucv = iucv_sk(sk); 1698 break; 1699 } 1700 read_unlock(&iucv_sk_list.lock); 1701 if (!iucv) 1702 /* No socket found, not one of our paths. */ 1703 return -EINVAL; 1704 1705 bh_lock_sock(sk); 1706 1707 /* Check if parent socket is listening */ 1708 low_nmcpy(user_data, iucv->src_name); 1709 high_nmcpy(user_data, iucv->dst_name); 1710 ASCEBC(user_data, sizeof(user_data)); 1711 if (sk->sk_state != IUCV_LISTEN) { 1712 err = pr_iucv->path_sever(path, user_data); 1713 iucv_path_free(path); 1714 goto fail; 1715 } 1716 1717 /* Check for backlog size */ 1718 if (sk_acceptq_is_full(sk)) { 1719 err = pr_iucv->path_sever(path, user_data); 1720 iucv_path_free(path); 1721 goto fail; 1722 } 1723 1724 /* Create the new socket */ 1725 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1726 if (!nsk) { 1727 err = pr_iucv->path_sever(path, user_data); 1728 iucv_path_free(path); 1729 goto fail; 1730 } 1731 1732 niucv = iucv_sk(nsk); 1733 iucv_sock_init(nsk, sk); 1734 1735 /* Set the new iucv_sock */ 1736 memcpy(niucv->dst_name, ipuser + 8, 8); 1737 EBCASC(niucv->dst_name, 8); 1738 memcpy(niucv->dst_user_id, ipvmid, 8); 1739 memcpy(niucv->src_name, iucv->src_name, 8); 1740 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1741 niucv->path = path; 1742 1743 /* Call iucv_accept */ 1744 high_nmcpy(nuser_data, ipuser + 8); 1745 memcpy(nuser_data + 8, niucv->src_name, 8); 1746 ASCEBC(nuser_data + 8, 8); 1747 1748 /* set message limit for path based on msglimit of accepting socket */ 1749 niucv->msglimit = iucv->msglimit; 1750 path->msglim = iucv->msglimit; 1751 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1752 if (err) { 1753 iucv_sever_path(nsk, 1); 1754 iucv_sock_kill(nsk); 1755 goto fail; 1756 } 1757 1758 iucv_accept_enqueue(sk, nsk); 1759 1760 /* Wake up accept */ 1761 nsk->sk_state = IUCV_CONNECTED; 1762 sk->sk_data_ready(sk); 1763 err = 0; 1764 fail: 1765 bh_unlock_sock(sk); 1766 return 0; 1767 } 1768 1769 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1770 { 1771 struct sock *sk = path->private; 1772 1773 sk->sk_state = IUCV_CONNECTED; 1774 sk->sk_state_change(sk); 1775 } 1776 1777 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1778 { 1779 struct sock *sk = path->private; 1780 struct iucv_sock *iucv = iucv_sk(sk); 1781 struct sk_buff *skb; 1782 struct sock_msg_q *save_msg; 1783 int len; 1784 1785 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1786 pr_iucv->message_reject(path, msg); 1787 return; 1788 } 1789 1790 spin_lock(&iucv->message_q.lock); 1791 1792 if (!list_empty(&iucv->message_q.list) || 1793 !skb_queue_empty(&iucv->backlog_skb_q)) 1794 goto save_message; 1795 1796 len = atomic_read(&sk->sk_rmem_alloc); 1797 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1798 if (len > sk->sk_rcvbuf) 1799 goto save_message; 1800 1801 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); 1802 if (!skb) 1803 goto save_message; 1804 1805 iucv_process_message(sk, skb, path, msg); 1806 goto out_unlock; 1807 1808 save_message: 1809 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1810 if (!save_msg) 1811 goto out_unlock; 1812 save_msg->path = path; 1813 save_msg->msg = *msg; 1814 1815 list_add_tail(&save_msg->list, &iucv->message_q.list); 1816 1817 out_unlock: 1818 spin_unlock(&iucv->message_q.lock); 1819 } 1820 1821 static void iucv_callback_txdone(struct iucv_path *path, 1822 struct iucv_message *msg) 1823 { 1824 struct sock *sk = path->private; 1825 struct sk_buff *this = NULL; 1826 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1827 struct sk_buff *list_skb = list->next; 1828 unsigned long flags; 1829 1830 bh_lock_sock(sk); 1831 if (!skb_queue_empty(list)) { 1832 spin_lock_irqsave(&list->lock, flags); 1833 1834 while (list_skb != (struct sk_buff *)list) { 1835 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1836 this = list_skb; 1837 break; 1838 } 1839 list_skb = list_skb->next; 1840 } 1841 if (this) 1842 __skb_unlink(this, list); 1843 1844 spin_unlock_irqrestore(&list->lock, flags); 1845 1846 if (this) { 1847 kfree_skb(this); 1848 /* wake up any process waiting for sending */ 1849 iucv_sock_wake_msglim(sk); 1850 } 1851 } 1852 1853 if (sk->sk_state == IUCV_CLOSING) { 1854 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1855 sk->sk_state = IUCV_CLOSED; 1856 sk->sk_state_change(sk); 1857 } 1858 } 1859 bh_unlock_sock(sk); 1860 1861 } 1862 1863 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1864 { 1865 struct sock *sk = path->private; 1866 1867 if (sk->sk_state == IUCV_CLOSED) 1868 return; 1869 1870 bh_lock_sock(sk); 1871 iucv_sever_path(sk, 1); 1872 sk->sk_state = IUCV_DISCONN; 1873 1874 sk->sk_state_change(sk); 1875 bh_unlock_sock(sk); 1876 } 1877 1878 /* called if the other communication side shuts down its RECV direction; 1879 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1880 */ 1881 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1882 { 1883 struct sock *sk = path->private; 1884 1885 bh_lock_sock(sk); 1886 if (sk->sk_state != IUCV_CLOSED) { 1887 sk->sk_shutdown |= SEND_SHUTDOWN; 1888 sk->sk_state_change(sk); 1889 } 1890 bh_unlock_sock(sk); 1891 } 1892 1893 /***************** HiperSockets transport callbacks ********************/ 1894 static void afiucv_swap_src_dest(struct sk_buff *skb) 1895 { 1896 struct af_iucv_trans_hdr *trans_hdr = 1897 (struct af_iucv_trans_hdr *)skb->data; 1898 char tmpID[8]; 1899 char tmpName[8]; 1900 1901 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1902 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1903 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1904 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1905 memcpy(tmpID, trans_hdr->srcUserID, 8); 1906 memcpy(tmpName, trans_hdr->srcAppName, 8); 1907 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1908 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1909 memcpy(trans_hdr->destUserID, tmpID, 8); 1910 memcpy(trans_hdr->destAppName, tmpName, 8); 1911 skb_push(skb, ETH_HLEN); 1912 memset(skb->data, 0, ETH_HLEN); 1913 } 1914 1915 /** 1916 * afiucv_hs_callback_syn - react on received SYN 1917 **/ 1918 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1919 { 1920 struct sock *nsk; 1921 struct iucv_sock *iucv, *niucv; 1922 struct af_iucv_trans_hdr *trans_hdr; 1923 int err; 1924 1925 iucv = iucv_sk(sk); 1926 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 1927 if (!iucv) { 1928 /* no sock - connection refused */ 1929 afiucv_swap_src_dest(skb); 1930 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1931 err = dev_queue_xmit(skb); 1932 goto out; 1933 } 1934 1935 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1936 bh_lock_sock(sk); 1937 if ((sk->sk_state != IUCV_LISTEN) || 1938 sk_acceptq_is_full(sk) || 1939 !nsk) { 1940 /* error on server socket - connection refused */ 1941 afiucv_swap_src_dest(skb); 1942 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1943 err = dev_queue_xmit(skb); 1944 iucv_sock_kill(nsk); 1945 bh_unlock_sock(sk); 1946 goto out; 1947 } 1948 1949 niucv = iucv_sk(nsk); 1950 iucv_sock_init(nsk, sk); 1951 niucv->transport = AF_IUCV_TRANS_HIPER; 1952 niucv->msglimit = iucv->msglimit; 1953 if (!trans_hdr->window) 1954 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1955 else 1956 niucv->msglimit_peer = trans_hdr->window; 1957 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1958 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1959 memcpy(niucv->src_name, iucv->src_name, 8); 1960 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1961 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1962 niucv->hs_dev = iucv->hs_dev; 1963 dev_hold(niucv->hs_dev); 1964 afiucv_swap_src_dest(skb); 1965 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1966 trans_hdr->window = niucv->msglimit; 1967 /* if receiver acks the xmit connection is established */ 1968 err = dev_queue_xmit(skb); 1969 if (!err) { 1970 iucv_accept_enqueue(sk, nsk); 1971 nsk->sk_state = IUCV_CONNECTED; 1972 sk->sk_data_ready(sk); 1973 } else 1974 iucv_sock_kill(nsk); 1975 bh_unlock_sock(sk); 1976 1977 out: 1978 return NET_RX_SUCCESS; 1979 } 1980 1981 /** 1982 * afiucv_hs_callback_synack() - react on received SYN-ACK 1983 **/ 1984 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 1985 { 1986 struct iucv_sock *iucv = iucv_sk(sk); 1987 struct af_iucv_trans_hdr *trans_hdr = 1988 (struct af_iucv_trans_hdr *)skb->data; 1989 1990 if (!iucv) 1991 goto out; 1992 if (sk->sk_state != IUCV_BOUND) 1993 goto out; 1994 bh_lock_sock(sk); 1995 iucv->msglimit_peer = trans_hdr->window; 1996 sk->sk_state = IUCV_CONNECTED; 1997 sk->sk_state_change(sk); 1998 bh_unlock_sock(sk); 1999 out: 2000 kfree_skb(skb); 2001 return NET_RX_SUCCESS; 2002 } 2003 2004 /** 2005 * afiucv_hs_callback_synfin() - react on received SYN_FIN 2006 **/ 2007 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 2008 { 2009 struct iucv_sock *iucv = iucv_sk(sk); 2010 2011 if (!iucv) 2012 goto out; 2013 if (sk->sk_state != IUCV_BOUND) 2014 goto out; 2015 bh_lock_sock(sk); 2016 sk->sk_state = IUCV_DISCONN; 2017 sk->sk_state_change(sk); 2018 bh_unlock_sock(sk); 2019 out: 2020 kfree_skb(skb); 2021 return NET_RX_SUCCESS; 2022 } 2023 2024 /** 2025 * afiucv_hs_callback_fin() - react on received FIN 2026 **/ 2027 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 2028 { 2029 struct iucv_sock *iucv = iucv_sk(sk); 2030 2031 /* other end of connection closed */ 2032 if (!iucv) 2033 goto out; 2034 bh_lock_sock(sk); 2035 if (sk->sk_state == IUCV_CONNECTED) { 2036 sk->sk_state = IUCV_DISCONN; 2037 sk->sk_state_change(sk); 2038 } 2039 bh_unlock_sock(sk); 2040 out: 2041 kfree_skb(skb); 2042 return NET_RX_SUCCESS; 2043 } 2044 2045 /** 2046 * afiucv_hs_callback_win() - react on received WIN 2047 **/ 2048 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2049 { 2050 struct iucv_sock *iucv = iucv_sk(sk); 2051 struct af_iucv_trans_hdr *trans_hdr = 2052 (struct af_iucv_trans_hdr *)skb->data; 2053 2054 if (!iucv) 2055 return NET_RX_SUCCESS; 2056 2057 if (sk->sk_state != IUCV_CONNECTED) 2058 return NET_RX_SUCCESS; 2059 2060 atomic_sub(trans_hdr->window, &iucv->msg_sent); 2061 iucv_sock_wake_msglim(sk); 2062 return NET_RX_SUCCESS; 2063 } 2064 2065 /** 2066 * afiucv_hs_callback_rx() - react on received data 2067 **/ 2068 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2069 { 2070 struct iucv_sock *iucv = iucv_sk(sk); 2071 2072 if (!iucv) { 2073 kfree_skb(skb); 2074 return NET_RX_SUCCESS; 2075 } 2076 2077 if (sk->sk_state != IUCV_CONNECTED) { 2078 kfree_skb(skb); 2079 return NET_RX_SUCCESS; 2080 } 2081 2082 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2083 kfree_skb(skb); 2084 return NET_RX_SUCCESS; 2085 } 2086 2087 /* write stuff from iucv_msg to skb cb */ 2088 if (skb->len < sizeof(struct af_iucv_trans_hdr)) { 2089 kfree_skb(skb); 2090 return NET_RX_SUCCESS; 2091 } 2092 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2093 skb_reset_transport_header(skb); 2094 skb_reset_network_header(skb); 2095 IUCV_SKB_CB(skb)->offset = 0; 2096 spin_lock(&iucv->message_q.lock); 2097 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2098 if (sock_queue_rcv_skb(sk, skb)) { 2099 /* handle rcv queue full */ 2100 skb_queue_tail(&iucv->backlog_skb_q, skb); 2101 } 2102 } else 2103 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2104 spin_unlock(&iucv->message_q.lock); 2105 return NET_RX_SUCCESS; 2106 } 2107 2108 /** 2109 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2110 * transport 2111 * called from netif RX softirq 2112 **/ 2113 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2114 struct packet_type *pt, struct net_device *orig_dev) 2115 { 2116 struct sock *sk; 2117 struct iucv_sock *iucv; 2118 struct af_iucv_trans_hdr *trans_hdr; 2119 char nullstring[8]; 2120 int err = 0; 2121 2122 skb_pull(skb, ETH_HLEN); 2123 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 2124 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2125 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2126 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2127 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2128 memset(nullstring, 0, sizeof(nullstring)); 2129 iucv = NULL; 2130 sk = NULL; 2131 read_lock(&iucv_sk_list.lock); 2132 sk_for_each(sk, &iucv_sk_list.head) { 2133 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2134 if ((!memcmp(&iucv_sk(sk)->src_name, 2135 trans_hdr->destAppName, 8)) && 2136 (!memcmp(&iucv_sk(sk)->src_user_id, 2137 trans_hdr->destUserID, 8)) && 2138 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2139 (!memcmp(&iucv_sk(sk)->dst_user_id, 2140 nullstring, 8))) { 2141 iucv = iucv_sk(sk); 2142 break; 2143 } 2144 } else { 2145 if ((!memcmp(&iucv_sk(sk)->src_name, 2146 trans_hdr->destAppName, 8)) && 2147 (!memcmp(&iucv_sk(sk)->src_user_id, 2148 trans_hdr->destUserID, 8)) && 2149 (!memcmp(&iucv_sk(sk)->dst_name, 2150 trans_hdr->srcAppName, 8)) && 2151 (!memcmp(&iucv_sk(sk)->dst_user_id, 2152 trans_hdr->srcUserID, 8))) { 2153 iucv = iucv_sk(sk); 2154 break; 2155 } 2156 } 2157 } 2158 read_unlock(&iucv_sk_list.lock); 2159 if (!iucv) 2160 sk = NULL; 2161 2162 /* no sock 2163 how should we send with no sock 2164 1) send without sock no send rc checking? 2165 2) introduce default sock to handle this cases 2166 2167 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2168 data -> send FIN 2169 SYN|ACK, SYN|FIN, FIN -> no action? */ 2170 2171 switch (trans_hdr->flags) { 2172 case AF_IUCV_FLAG_SYN: 2173 /* connect request */ 2174 err = afiucv_hs_callback_syn(sk, skb); 2175 break; 2176 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2177 /* connect request confirmed */ 2178 err = afiucv_hs_callback_synack(sk, skb); 2179 break; 2180 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2181 /* connect request refused */ 2182 err = afiucv_hs_callback_synfin(sk, skb); 2183 break; 2184 case (AF_IUCV_FLAG_FIN): 2185 /* close request */ 2186 err = afiucv_hs_callback_fin(sk, skb); 2187 break; 2188 case (AF_IUCV_FLAG_WIN): 2189 err = afiucv_hs_callback_win(sk, skb); 2190 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2191 kfree_skb(skb); 2192 break; 2193 } 2194 /* fall through and receive non-zero length data */ 2195 case (AF_IUCV_FLAG_SHT): 2196 /* shutdown request */ 2197 /* fall through and receive zero length data */ 2198 case 0: 2199 /* plain data frame */ 2200 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2201 err = afiucv_hs_callback_rx(sk, skb); 2202 break; 2203 default: 2204 ; 2205 } 2206 2207 return err; 2208 } 2209 2210 /** 2211 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2212 * transport 2213 **/ 2214 static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2215 enum iucv_tx_notify n) 2216 { 2217 struct sock *isk = skb->sk; 2218 struct sock *sk = NULL; 2219 struct iucv_sock *iucv = NULL; 2220 struct sk_buff_head *list; 2221 struct sk_buff *list_skb; 2222 struct sk_buff *nskb; 2223 unsigned long flags; 2224 2225 read_lock_irqsave(&iucv_sk_list.lock, flags); 2226 sk_for_each(sk, &iucv_sk_list.head) 2227 if (sk == isk) { 2228 iucv = iucv_sk(sk); 2229 break; 2230 } 2231 read_unlock_irqrestore(&iucv_sk_list.lock, flags); 2232 2233 if (!iucv || sock_flag(sk, SOCK_ZAPPED)) 2234 return; 2235 2236 list = &iucv->send_skb_q; 2237 spin_lock_irqsave(&list->lock, flags); 2238 if (skb_queue_empty(list)) 2239 goto out_unlock; 2240 list_skb = list->next; 2241 nskb = list_skb->next; 2242 while (list_skb != (struct sk_buff *)list) { 2243 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2244 switch (n) { 2245 case TX_NOTIFY_OK: 2246 __skb_unlink(list_skb, list); 2247 kfree_skb(list_skb); 2248 iucv_sock_wake_msglim(sk); 2249 break; 2250 case TX_NOTIFY_PENDING: 2251 atomic_inc(&iucv->pendings); 2252 break; 2253 case TX_NOTIFY_DELAYED_OK: 2254 __skb_unlink(list_skb, list); 2255 atomic_dec(&iucv->pendings); 2256 if (atomic_read(&iucv->pendings) <= 0) 2257 iucv_sock_wake_msglim(sk); 2258 kfree_skb(list_skb); 2259 break; 2260 case TX_NOTIFY_UNREACHABLE: 2261 case TX_NOTIFY_DELAYED_UNREACHABLE: 2262 case TX_NOTIFY_TPQFULL: /* not yet used */ 2263 case TX_NOTIFY_GENERALERROR: 2264 case TX_NOTIFY_DELAYED_GENERALERROR: 2265 __skb_unlink(list_skb, list); 2266 kfree_skb(list_skb); 2267 if (sk->sk_state == IUCV_CONNECTED) { 2268 sk->sk_state = IUCV_DISCONN; 2269 sk->sk_state_change(sk); 2270 } 2271 break; 2272 } 2273 break; 2274 } 2275 list_skb = nskb; 2276 nskb = nskb->next; 2277 } 2278 out_unlock: 2279 spin_unlock_irqrestore(&list->lock, flags); 2280 2281 if (sk->sk_state == IUCV_CLOSING) { 2282 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2283 sk->sk_state = IUCV_CLOSED; 2284 sk->sk_state_change(sk); 2285 } 2286 } 2287 2288 } 2289 2290 /* 2291 * afiucv_netdev_event: handle netdev notifier chain events 2292 */ 2293 static int afiucv_netdev_event(struct notifier_block *this, 2294 unsigned long event, void *ptr) 2295 { 2296 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2297 struct sock *sk; 2298 struct iucv_sock *iucv; 2299 2300 switch (event) { 2301 case NETDEV_REBOOT: 2302 case NETDEV_GOING_DOWN: 2303 sk_for_each(sk, &iucv_sk_list.head) { 2304 iucv = iucv_sk(sk); 2305 if ((iucv->hs_dev == event_dev) && 2306 (sk->sk_state == IUCV_CONNECTED)) { 2307 if (event == NETDEV_GOING_DOWN) 2308 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2309 sk->sk_state = IUCV_DISCONN; 2310 sk->sk_state_change(sk); 2311 } 2312 } 2313 break; 2314 case NETDEV_DOWN: 2315 case NETDEV_UNREGISTER: 2316 default: 2317 break; 2318 } 2319 return NOTIFY_DONE; 2320 } 2321 2322 static struct notifier_block afiucv_netdev_notifier = { 2323 .notifier_call = afiucv_netdev_event, 2324 }; 2325 2326 static const struct proto_ops iucv_sock_ops = { 2327 .family = PF_IUCV, 2328 .owner = THIS_MODULE, 2329 .release = iucv_sock_release, 2330 .bind = iucv_sock_bind, 2331 .connect = iucv_sock_connect, 2332 .listen = iucv_sock_listen, 2333 .accept = iucv_sock_accept, 2334 .getname = iucv_sock_getname, 2335 .sendmsg = iucv_sock_sendmsg, 2336 .recvmsg = iucv_sock_recvmsg, 2337 .poll = iucv_sock_poll, 2338 .ioctl = sock_no_ioctl, 2339 .mmap = sock_no_mmap, 2340 .socketpair = sock_no_socketpair, 2341 .shutdown = iucv_sock_shutdown, 2342 .setsockopt = iucv_sock_setsockopt, 2343 .getsockopt = iucv_sock_getsockopt, 2344 }; 2345 2346 static const struct net_proto_family iucv_sock_family_ops = { 2347 .family = AF_IUCV, 2348 .owner = THIS_MODULE, 2349 .create = iucv_sock_create, 2350 }; 2351 2352 static struct packet_type iucv_packet_type = { 2353 .type = cpu_to_be16(ETH_P_AF_IUCV), 2354 .func = afiucv_hs_rcv, 2355 }; 2356 2357 static int afiucv_iucv_init(void) 2358 { 2359 int err; 2360 2361 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2362 if (err) 2363 goto out; 2364 /* establish dummy device */ 2365 af_iucv_driver.bus = pr_iucv->bus; 2366 err = driver_register(&af_iucv_driver); 2367 if (err) 2368 goto out_iucv; 2369 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 2370 if (!af_iucv_dev) { 2371 err = -ENOMEM; 2372 goto out_driver; 2373 } 2374 dev_set_name(af_iucv_dev, "af_iucv"); 2375 af_iucv_dev->bus = pr_iucv->bus; 2376 af_iucv_dev->parent = pr_iucv->root; 2377 af_iucv_dev->release = (void (*)(struct device *))kfree; 2378 af_iucv_dev->driver = &af_iucv_driver; 2379 err = device_register(af_iucv_dev); 2380 if (err) 2381 goto out_driver; 2382 return 0; 2383 2384 out_driver: 2385 driver_unregister(&af_iucv_driver); 2386 out_iucv: 2387 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2388 out: 2389 return err; 2390 } 2391 2392 static int __init afiucv_init(void) 2393 { 2394 int err; 2395 2396 if (MACHINE_IS_VM) { 2397 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2398 if (unlikely(err)) { 2399 WARN_ON(err); 2400 err = -EPROTONOSUPPORT; 2401 goto out; 2402 } 2403 2404 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2405 if (!pr_iucv) { 2406 printk(KERN_WARNING "iucv_if lookup failed\n"); 2407 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2408 } 2409 } else { 2410 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2411 pr_iucv = NULL; 2412 } 2413 2414 err = proto_register(&iucv_proto, 0); 2415 if (err) 2416 goto out; 2417 err = sock_register(&iucv_sock_family_ops); 2418 if (err) 2419 goto out_proto; 2420 2421 if (pr_iucv) { 2422 err = afiucv_iucv_init(); 2423 if (err) 2424 goto out_sock; 2425 } else 2426 register_netdevice_notifier(&afiucv_netdev_notifier); 2427 dev_add_pack(&iucv_packet_type); 2428 return 0; 2429 2430 out_sock: 2431 sock_unregister(PF_IUCV); 2432 out_proto: 2433 proto_unregister(&iucv_proto); 2434 out: 2435 if (pr_iucv) 2436 symbol_put(iucv_if); 2437 return err; 2438 } 2439 2440 static void __exit afiucv_exit(void) 2441 { 2442 if (pr_iucv) { 2443 device_unregister(af_iucv_dev); 2444 driver_unregister(&af_iucv_driver); 2445 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2446 symbol_put(iucv_if); 2447 } else 2448 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2449 dev_remove_pack(&iucv_packet_type); 2450 sock_unregister(PF_IUCV); 2451 proto_unregister(&iucv_proto); 2452 } 2453 2454 module_init(afiucv_init); 2455 module_exit(afiucv_exit); 2456 2457 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2458 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2459 MODULE_VERSION(VERSION); 2460 MODULE_LICENSE("GPL"); 2461 MODULE_ALIAS_NETPROTO(PF_IUCV); 2462 2463