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