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