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 <linux/security.h> 26 #include <net/sock.h> 27 #include <asm/ebcdic.h> 28 #include <asm/cpcmd.h> 29 #include <linux/kmod.h> 30 31 #include <net/iucv/af_iucv.h> 32 33 #define VERSION "1.2" 34 35 static char iucv_userid[80]; 36 37 static const struct proto_ops iucv_sock_ops; 38 39 static struct proto iucv_proto = { 40 .name = "AF_IUCV", 41 .owner = THIS_MODULE, 42 .obj_size = sizeof(struct iucv_sock), 43 }; 44 45 static struct iucv_interface *pr_iucv; 46 47 /* special AF_IUCV IPRM messages */ 48 static const u8 iprm_shutdown[8] = 49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 50 51 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) 52 53 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 54 do { \ 55 DEFINE_WAIT(__wait); \ 56 long __timeo = timeo; \ 57 ret = 0; \ 58 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 59 while (!(condition)) { \ 60 if (!__timeo) { \ 61 ret = -EAGAIN; \ 62 break; \ 63 } \ 64 if (signal_pending(current)) { \ 65 ret = sock_intr_errno(__timeo); \ 66 break; \ 67 } \ 68 release_sock(sk); \ 69 __timeo = schedule_timeout(__timeo); \ 70 lock_sock(sk); \ 71 ret = sock_error(sk); \ 72 if (ret) \ 73 break; \ 74 } \ 75 finish_wait(sk_sleep(sk), &__wait); \ 76 } while (0) 77 78 #define iucv_sock_wait(sk, condition, timeo) \ 79 ({ \ 80 int __ret = 0; \ 81 if (!(condition)) \ 82 __iucv_sock_wait(sk, condition, timeo, __ret); \ 83 __ret; \ 84 }) 85 86 static void iucv_sock_kill(struct sock *sk); 87 static void iucv_sock_close(struct sock *sk); 88 static void iucv_sever_path(struct sock *, int); 89 90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 91 struct packet_type *pt, struct net_device *orig_dev); 92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 93 struct sk_buff *skb, u8 flags); 94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); 95 96 /* Call Back functions */ 97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 99 static void iucv_callback_connack(struct iucv_path *, u8 *); 100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *); 101 static void iucv_callback_connrej(struct iucv_path *, u8 *); 102 static void iucv_callback_shutdown(struct iucv_path *, u8 *); 103 104 static struct iucv_sock_list iucv_sk_list = { 105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 106 .autobind_name = ATOMIC_INIT(0) 107 }; 108 109 static struct iucv_handler af_iucv_handler = { 110 .path_pending = iucv_callback_connreq, 111 .path_complete = iucv_callback_connack, 112 .path_severed = iucv_callback_connrej, 113 .message_pending = iucv_callback_rx, 114 .message_complete = iucv_callback_txdone, 115 .path_quiesced = iucv_callback_shutdown, 116 }; 117 118 static inline void high_nmcpy(unsigned char *dst, char *src) 119 { 120 memcpy(dst, src, 8); 121 } 122 123 static inline void low_nmcpy(unsigned char *dst, char *src) 124 { 125 memcpy(&dst[8], src, 8); 126 } 127 128 static int afiucv_pm_prepare(struct device *dev) 129 { 130 #ifdef CONFIG_PM_DEBUG 131 printk(KERN_WARNING "afiucv_pm_prepare\n"); 132 #endif 133 return 0; 134 } 135 136 static void afiucv_pm_complete(struct device *dev) 137 { 138 #ifdef CONFIG_PM_DEBUG 139 printk(KERN_WARNING "afiucv_pm_complete\n"); 140 #endif 141 } 142 143 /** 144 * afiucv_pm_freeze() - Freeze PM callback 145 * @dev: AFIUCV dummy device 146 * 147 * Sever all established IUCV communication pathes 148 */ 149 static int afiucv_pm_freeze(struct device *dev) 150 { 151 struct iucv_sock *iucv; 152 struct sock *sk; 153 int err = 0; 154 155 #ifdef CONFIG_PM_DEBUG 156 printk(KERN_WARNING "afiucv_pm_freeze\n"); 157 #endif 158 read_lock(&iucv_sk_list.lock); 159 sk_for_each(sk, &iucv_sk_list.head) { 160 iucv = iucv_sk(sk); 161 switch (sk->sk_state) { 162 case IUCV_DISCONN: 163 case IUCV_CLOSING: 164 case IUCV_CONNECTED: 165 iucv_sever_path(sk, 0); 166 break; 167 case IUCV_OPEN: 168 case IUCV_BOUND: 169 case IUCV_LISTEN: 170 case IUCV_CLOSED: 171 default: 172 break; 173 } 174 skb_queue_purge(&iucv->send_skb_q); 175 skb_queue_purge(&iucv->backlog_skb_q); 176 } 177 read_unlock(&iucv_sk_list.lock); 178 return err; 179 } 180 181 /** 182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback 183 * @dev: AFIUCV dummy device 184 * 185 * socket clean up after freeze 186 */ 187 static int afiucv_pm_restore_thaw(struct device *dev) 188 { 189 struct sock *sk; 190 191 #ifdef CONFIG_PM_DEBUG 192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); 193 #endif 194 read_lock(&iucv_sk_list.lock); 195 sk_for_each(sk, &iucv_sk_list.head) { 196 switch (sk->sk_state) { 197 case IUCV_CONNECTED: 198 sk->sk_err = EPIPE; 199 sk->sk_state = IUCV_DISCONN; 200 sk->sk_state_change(sk); 201 break; 202 case IUCV_DISCONN: 203 case IUCV_CLOSING: 204 case IUCV_LISTEN: 205 case IUCV_BOUND: 206 case IUCV_OPEN: 207 default: 208 break; 209 } 210 } 211 read_unlock(&iucv_sk_list.lock); 212 return 0; 213 } 214 215 static const struct dev_pm_ops afiucv_pm_ops = { 216 .prepare = afiucv_pm_prepare, 217 .complete = afiucv_pm_complete, 218 .freeze = afiucv_pm_freeze, 219 .thaw = afiucv_pm_restore_thaw, 220 .restore = afiucv_pm_restore_thaw, 221 }; 222 223 static struct device_driver af_iucv_driver = { 224 .owner = THIS_MODULE, 225 .name = "afiucv", 226 .bus = NULL, 227 .pm = &afiucv_pm_ops, 228 }; 229 230 /* dummy device used as trigger for PM functions */ 231 static struct device *af_iucv_dev; 232 233 /** 234 * iucv_msg_length() - Returns the length of an iucv message. 235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 236 * 237 * The function returns the length of the specified iucv message @msg of data 238 * stored in a buffer and of data stored in the parameter list (PRMDATA). 239 * 240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 241 * data: 242 * PRMDATA[0..6] socket data (max 7 bytes); 243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 244 * 245 * The socket data length is computed by subtracting the socket data length 246 * value from 0xFF. 247 * If the socket data len is greater 7, then PRMDATA can be used for special 248 * notifications (see iucv_sock_shutdown); and further, 249 * if the socket data len is > 7, the function returns 8. 250 * 251 * Use this function to allocate socket buffers to store iucv message data. 252 */ 253 static inline size_t iucv_msg_length(struct iucv_message *msg) 254 { 255 size_t datalen; 256 257 if (msg->flags & IUCV_IPRMDATA) { 258 datalen = 0xff - msg->rmmsg[7]; 259 return (datalen < 8) ? datalen : 8; 260 } 261 return msg->length; 262 } 263 264 /** 265 * iucv_sock_in_state() - check for specific states 266 * @sk: sock structure 267 * @state: first iucv sk state 268 * @state: second iucv sk state 269 * 270 * Returns true if the socket in either in the first or second state. 271 */ 272 static int iucv_sock_in_state(struct sock *sk, int state, int state2) 273 { 274 return (sk->sk_state == state || sk->sk_state == state2); 275 } 276 277 /** 278 * iucv_below_msglim() - function to check if messages can be sent 279 * @sk: sock structure 280 * 281 * Returns true if the send queue length is lower than the message limit. 282 * Always returns true if the socket is not connected (no iucv path for 283 * checking the message limit). 284 */ 285 static inline int iucv_below_msglim(struct sock *sk) 286 { 287 struct iucv_sock *iucv = iucv_sk(sk); 288 289 if (sk->sk_state != IUCV_CONNECTED) 290 return 1; 291 if (iucv->transport == AF_IUCV_TRANS_IUCV) 292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); 293 else 294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 295 (atomic_read(&iucv->pendings) <= 0)); 296 } 297 298 /** 299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 300 */ 301 static void iucv_sock_wake_msglim(struct sock *sk) 302 { 303 struct socket_wq *wq; 304 305 rcu_read_lock(); 306 wq = rcu_dereference(sk->sk_wq); 307 if (skwq_has_sleeper(wq)) 308 wake_up_interruptible_all(&wq->wait); 309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 310 rcu_read_unlock(); 311 } 312 313 /** 314 * afiucv_hs_send() - send a message through HiperSockets transport 315 */ 316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 317 struct sk_buff *skb, u8 flags) 318 { 319 struct iucv_sock *iucv = iucv_sk(sock); 320 struct af_iucv_trans_hdr *phs_hdr; 321 struct sk_buff *nskb; 322 int err, confirm_recv = 0; 323 324 memset(skb->head, 0, ETH_HLEN); 325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, 326 sizeof(struct af_iucv_trans_hdr)); 327 skb_reset_mac_header(skb); 328 skb_reset_network_header(skb); 329 skb_push(skb, ETH_HLEN); 330 skb_reset_mac_header(skb); 331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); 332 333 phs_hdr->magic = ETH_P_AF_IUCV; 334 phs_hdr->version = 1; 335 phs_hdr->flags = flags; 336 if (flags == AF_IUCV_FLAG_SYN) 337 phs_hdr->window = iucv->msglimit; 338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 339 confirm_recv = atomic_read(&iucv->msg_recv); 340 phs_hdr->window = confirm_recv; 341 if (confirm_recv) 342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 343 } 344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 352 if (imsg) 353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 354 355 skb->dev = iucv->hs_dev; 356 if (!skb->dev) 357 return -ENODEV; 358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) 359 return -ENETDOWN; 360 if (skb->len > skb->dev->mtu) { 361 if (sock->sk_type == SOCK_SEQPACKET) 362 return -EMSGSIZE; 363 else 364 skb_trim(skb, skb->dev->mtu); 365 } 366 skb->protocol = ETH_P_AF_IUCV; 367 nskb = skb_clone(skb, GFP_ATOMIC); 368 if (!nskb) 369 return -ENOMEM; 370 skb_queue_tail(&iucv->send_skb_q, nskb); 371 err = dev_queue_xmit(skb); 372 if (net_xmit_eval(err)) { 373 skb_unlink(nskb, &iucv->send_skb_q); 374 kfree_skb(nskb); 375 } else { 376 atomic_sub(confirm_recv, &iucv->msg_recv); 377 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 378 } 379 return net_xmit_eval(err); 380 } 381 382 static struct sock *__iucv_get_sock_by_name(char *nm) 383 { 384 struct sock *sk; 385 386 sk_for_each(sk, &iucv_sk_list.head) 387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 388 return sk; 389 390 return NULL; 391 } 392 393 static void iucv_sock_destruct(struct sock *sk) 394 { 395 skb_queue_purge(&sk->sk_receive_queue); 396 skb_queue_purge(&sk->sk_error_queue); 397 398 sk_mem_reclaim(sk); 399 400 if (!sock_flag(sk, SOCK_DEAD)) { 401 pr_err("Attempt to release alive iucv socket %p\n", sk); 402 return; 403 } 404 405 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 406 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 407 WARN_ON(sk->sk_wmem_queued); 408 WARN_ON(sk->sk_forward_alloc); 409 } 410 411 /* Cleanup Listen */ 412 static void iucv_sock_cleanup_listen(struct sock *parent) 413 { 414 struct sock *sk; 415 416 /* Close non-accepted connections */ 417 while ((sk = iucv_accept_dequeue(parent, NULL))) { 418 iucv_sock_close(sk); 419 iucv_sock_kill(sk); 420 } 421 422 parent->sk_state = IUCV_CLOSED; 423 } 424 425 /* Kill socket (only if zapped and orphaned) */ 426 static void iucv_sock_kill(struct sock *sk) 427 { 428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 429 return; 430 431 iucv_sock_unlink(&iucv_sk_list, sk); 432 sock_set_flag(sk, SOCK_DEAD); 433 sock_put(sk); 434 } 435 436 /* Terminate an IUCV path */ 437 static void iucv_sever_path(struct sock *sk, int with_user_data) 438 { 439 unsigned char user_data[16]; 440 struct iucv_sock *iucv = iucv_sk(sk); 441 struct iucv_path *path = iucv->path; 442 443 if (iucv->path) { 444 iucv->path = NULL; 445 if (with_user_data) { 446 low_nmcpy(user_data, iucv->src_name); 447 high_nmcpy(user_data, iucv->dst_name); 448 ASCEBC(user_data, sizeof(user_data)); 449 pr_iucv->path_sever(path, user_data); 450 } else 451 pr_iucv->path_sever(path, NULL); 452 iucv_path_free(path); 453 } 454 } 455 456 /* Send 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 security_sk_clone(parent, sk); 537 } 538 } 539 540 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 541 { 542 struct sock *sk; 543 struct iucv_sock *iucv; 544 545 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 546 if (!sk) 547 return NULL; 548 iucv = iucv_sk(sk); 549 550 sock_init_data(sock, sk); 551 INIT_LIST_HEAD(&iucv->accept_q); 552 spin_lock_init(&iucv->accept_q_lock); 553 skb_queue_head_init(&iucv->send_skb_q); 554 INIT_LIST_HEAD(&iucv->message_q.list); 555 spin_lock_init(&iucv->message_q.lock); 556 skb_queue_head_init(&iucv->backlog_skb_q); 557 iucv->send_tag = 0; 558 atomic_set(&iucv->pendings, 0); 559 iucv->flags = 0; 560 iucv->msglimit = 0; 561 atomic_set(&iucv->msg_sent, 0); 562 atomic_set(&iucv->msg_recv, 0); 563 iucv->path = NULL; 564 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 565 memset(&iucv->src_user_id , 0, 32); 566 if (pr_iucv) 567 iucv->transport = AF_IUCV_TRANS_IUCV; 568 else 569 iucv->transport = AF_IUCV_TRANS_HIPER; 570 571 sk->sk_destruct = iucv_sock_destruct; 572 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 573 sk->sk_allocation = GFP_DMA; 574 575 sock_reset_flag(sk, SOCK_ZAPPED); 576 577 sk->sk_protocol = proto; 578 sk->sk_state = IUCV_OPEN; 579 580 iucv_sock_link(&iucv_sk_list, sk); 581 return sk; 582 } 583 584 /* Create an IUCV socket */ 585 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 586 int kern) 587 { 588 struct sock *sk; 589 590 if (protocol && protocol != PF_IUCV) 591 return -EPROTONOSUPPORT; 592 593 sock->state = SS_UNCONNECTED; 594 595 switch (sock->type) { 596 case SOCK_STREAM: 597 sock->ops = &iucv_sock_ops; 598 break; 599 case SOCK_SEQPACKET: 600 /* currently, proto ops can handle both sk types */ 601 sock->ops = &iucv_sock_ops; 602 break; 603 default: 604 return -ESOCKTNOSUPPORT; 605 } 606 607 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 608 if (!sk) 609 return -ENOMEM; 610 611 iucv_sock_init(sk, NULL); 612 613 return 0; 614 } 615 616 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 617 { 618 write_lock_bh(&l->lock); 619 sk_add_node(sk, &l->head); 620 write_unlock_bh(&l->lock); 621 } 622 623 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 624 { 625 write_lock_bh(&l->lock); 626 sk_del_node_init(sk); 627 write_unlock_bh(&l->lock); 628 } 629 630 void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 631 { 632 unsigned long flags; 633 struct iucv_sock *par = iucv_sk(parent); 634 635 sock_hold(sk); 636 spin_lock_irqsave(&par->accept_q_lock, flags); 637 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 638 spin_unlock_irqrestore(&par->accept_q_lock, flags); 639 iucv_sk(sk)->parent = parent; 640 sk_acceptq_added(parent); 641 } 642 643 void iucv_accept_unlink(struct sock *sk) 644 { 645 unsigned long flags; 646 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 647 648 spin_lock_irqsave(&par->accept_q_lock, flags); 649 list_del_init(&iucv_sk(sk)->accept_q); 650 spin_unlock_irqrestore(&par->accept_q_lock, flags); 651 sk_acceptq_removed(iucv_sk(sk)->parent); 652 iucv_sk(sk)->parent = NULL; 653 sock_put(sk); 654 } 655 656 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 657 { 658 struct iucv_sock *isk, *n; 659 struct sock *sk; 660 661 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 662 sk = (struct sock *) isk; 663 lock_sock(sk); 664 665 if (sk->sk_state == IUCV_CLOSED) { 666 iucv_accept_unlink(sk); 667 release_sock(sk); 668 continue; 669 } 670 671 if (sk->sk_state == IUCV_CONNECTED || 672 sk->sk_state == IUCV_DISCONN || 673 !newsock) { 674 iucv_accept_unlink(sk); 675 if (newsock) 676 sock_graft(sk, newsock); 677 678 release_sock(sk); 679 return sk; 680 } 681 682 release_sock(sk); 683 } 684 return NULL; 685 } 686 687 static void __iucv_auto_name(struct iucv_sock *iucv) 688 { 689 char name[12]; 690 691 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 692 while (__iucv_get_sock_by_name(name)) { 693 sprintf(name, "%08x", 694 atomic_inc_return(&iucv_sk_list.autobind_name)); 695 } 696 memcpy(iucv->src_name, name, 8); 697 } 698 699 /* Bind an unbound socket */ 700 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 701 int addr_len) 702 { 703 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 704 struct sock *sk = sock->sk; 705 struct iucv_sock *iucv; 706 int err = 0; 707 struct net_device *dev; 708 char uid[9]; 709 710 /* Verify the input sockaddr */ 711 if (!addr || addr->sa_family != AF_IUCV) 712 return -EINVAL; 713 714 if (addr_len < sizeof(struct sockaddr_iucv)) 715 return -EINVAL; 716 717 lock_sock(sk); 718 if (sk->sk_state != IUCV_OPEN) { 719 err = -EBADFD; 720 goto done; 721 } 722 723 write_lock_bh(&iucv_sk_list.lock); 724 725 iucv = iucv_sk(sk); 726 if (__iucv_get_sock_by_name(sa->siucv_name)) { 727 err = -EADDRINUSE; 728 goto done_unlock; 729 } 730 if (iucv->path) 731 goto done_unlock; 732 733 /* Bind the socket */ 734 if (pr_iucv) 735 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 736 goto vm_bind; /* VM IUCV transport */ 737 738 /* try hiper transport */ 739 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 740 ASCEBC(uid, 8); 741 rcu_read_lock(); 742 for_each_netdev_rcu(&init_net, dev) { 743 if (!memcmp(dev->perm_addr, uid, 8)) { 744 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 745 /* Check for unitialized siucv_name */ 746 if (strncmp(sa->siucv_name, " ", 8) == 0) 747 __iucv_auto_name(iucv); 748 else 749 memcpy(iucv->src_name, sa->siucv_name, 8); 750 sk->sk_bound_dev_if = dev->ifindex; 751 iucv->hs_dev = dev; 752 dev_hold(dev); 753 sk->sk_state = IUCV_BOUND; 754 iucv->transport = AF_IUCV_TRANS_HIPER; 755 if (!iucv->msglimit) 756 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 757 rcu_read_unlock(); 758 goto done_unlock; 759 } 760 } 761 rcu_read_unlock(); 762 vm_bind: 763 if (pr_iucv) { 764 /* use local userid for backward compat */ 765 memcpy(iucv->src_name, sa->siucv_name, 8); 766 memcpy(iucv->src_user_id, iucv_userid, 8); 767 sk->sk_state = IUCV_BOUND; 768 iucv->transport = AF_IUCV_TRANS_IUCV; 769 if (!iucv->msglimit) 770 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 771 goto done_unlock; 772 } 773 /* found no dev to bind */ 774 err = -ENODEV; 775 done_unlock: 776 /* Release the socket list lock */ 777 write_unlock_bh(&iucv_sk_list.lock); 778 done: 779 release_sock(sk); 780 return err; 781 } 782 783 /* Automatically bind an unbound socket */ 784 static int iucv_sock_autobind(struct sock *sk) 785 { 786 struct iucv_sock *iucv = iucv_sk(sk); 787 int err = 0; 788 789 if (unlikely(!pr_iucv)) 790 return -EPROTO; 791 792 memcpy(iucv->src_user_id, iucv_userid, 8); 793 794 write_lock_bh(&iucv_sk_list.lock); 795 __iucv_auto_name(iucv); 796 write_unlock_bh(&iucv_sk_list.lock); 797 798 if (!iucv->msglimit) 799 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 800 801 return err; 802 } 803 804 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 805 { 806 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 807 struct sock *sk = sock->sk; 808 struct iucv_sock *iucv = iucv_sk(sk); 809 unsigned char user_data[16]; 810 int err; 811 812 high_nmcpy(user_data, sa->siucv_name); 813 low_nmcpy(user_data, iucv->src_name); 814 ASCEBC(user_data, sizeof(user_data)); 815 816 /* Create path. */ 817 iucv->path = iucv_path_alloc(iucv->msglimit, 818 IUCV_IPRMDATA, GFP_KERNEL); 819 if (!iucv->path) { 820 err = -ENOMEM; 821 goto done; 822 } 823 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 824 sa->siucv_user_id, NULL, user_data, 825 sk); 826 if (err) { 827 iucv_path_free(iucv->path); 828 iucv->path = NULL; 829 switch (err) { 830 case 0x0b: /* Target communicator is not logged on */ 831 err = -ENETUNREACH; 832 break; 833 case 0x0d: /* Max connections for this guest exceeded */ 834 case 0x0e: /* Max connections for target guest exceeded */ 835 err = -EAGAIN; 836 break; 837 case 0x0f: /* Missing IUCV authorization */ 838 err = -EACCES; 839 break; 840 default: 841 err = -ECONNREFUSED; 842 break; 843 } 844 } 845 done: 846 return err; 847 } 848 849 /* Connect an unconnected socket */ 850 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 851 int alen, int flags) 852 { 853 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 854 struct sock *sk = sock->sk; 855 struct iucv_sock *iucv = iucv_sk(sk); 856 int err; 857 858 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) 859 return -EINVAL; 860 861 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 862 return -EBADFD; 863 864 if (sk->sk_state == IUCV_OPEN && 865 iucv->transport == AF_IUCV_TRANS_HIPER) 866 return -EBADFD; /* explicit bind required */ 867 868 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 869 return -EINVAL; 870 871 if (sk->sk_state == IUCV_OPEN) { 872 err = iucv_sock_autobind(sk); 873 if (unlikely(err)) 874 return err; 875 } 876 877 lock_sock(sk); 878 879 /* Set the destination information */ 880 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 881 memcpy(iucv->dst_name, sa->siucv_name, 8); 882 883 if (iucv->transport == AF_IUCV_TRANS_HIPER) 884 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 885 else 886 err = afiucv_path_connect(sock, addr); 887 if (err) 888 goto done; 889 890 if (sk->sk_state != IUCV_CONNECTED) 891 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 892 IUCV_DISCONN), 893 sock_sndtimeo(sk, flags & O_NONBLOCK)); 894 895 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 896 err = -ECONNREFUSED; 897 898 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 899 iucv_sever_path(sk, 0); 900 901 done: 902 release_sock(sk); 903 return err; 904 } 905 906 /* Move a socket into listening state. */ 907 static int iucv_sock_listen(struct socket *sock, int backlog) 908 { 909 struct sock *sk = sock->sk; 910 int err; 911 912 lock_sock(sk); 913 914 err = -EINVAL; 915 if (sk->sk_state != IUCV_BOUND) 916 goto done; 917 918 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 919 goto done; 920 921 sk->sk_max_ack_backlog = backlog; 922 sk->sk_ack_backlog = 0; 923 sk->sk_state = IUCV_LISTEN; 924 err = 0; 925 926 done: 927 release_sock(sk); 928 return err; 929 } 930 931 /* Accept a pending connection */ 932 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 933 int flags) 934 { 935 DECLARE_WAITQUEUE(wait, current); 936 struct sock *sk = sock->sk, *nsk; 937 long timeo; 938 int err = 0; 939 940 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 941 942 if (sk->sk_state != IUCV_LISTEN) { 943 err = -EBADFD; 944 goto done; 945 } 946 947 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 948 949 /* Wait for an incoming connection */ 950 add_wait_queue_exclusive(sk_sleep(sk), &wait); 951 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 952 set_current_state(TASK_INTERRUPTIBLE); 953 if (!timeo) { 954 err = -EAGAIN; 955 break; 956 } 957 958 release_sock(sk); 959 timeo = schedule_timeout(timeo); 960 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 961 962 if (sk->sk_state != IUCV_LISTEN) { 963 err = -EBADFD; 964 break; 965 } 966 967 if (signal_pending(current)) { 968 err = sock_intr_errno(timeo); 969 break; 970 } 971 } 972 973 set_current_state(TASK_RUNNING); 974 remove_wait_queue(sk_sleep(sk), &wait); 975 976 if (err) 977 goto done; 978 979 newsock->state = SS_CONNECTED; 980 981 done: 982 release_sock(sk); 983 return err; 984 } 985 986 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 987 int *len, int peer) 988 { 989 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 990 struct sock *sk = sock->sk; 991 struct iucv_sock *iucv = iucv_sk(sk); 992 993 addr->sa_family = AF_IUCV; 994 *len = sizeof(struct sockaddr_iucv); 995 996 if (peer) { 997 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 998 memcpy(siucv->siucv_name, iucv->dst_name, 8); 999 } else { 1000 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 1001 memcpy(siucv->siucv_name, iucv->src_name, 8); 1002 } 1003 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 1004 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 1005 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 1006 1007 return 0; 1008 } 1009 1010 /** 1011 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 1012 * @path: IUCV path 1013 * @msg: Pointer to a struct iucv_message 1014 * @skb: The socket data to send, skb->len MUST BE <= 7 1015 * 1016 * Send the socket data in the parameter list in the iucv message 1017 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 1018 * list and the socket data len at index 7 (last byte). 1019 * See also iucv_msg_length(). 1020 * 1021 * Returns the error code from the iucv_message_send() call. 1022 */ 1023 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 1024 struct sk_buff *skb) 1025 { 1026 u8 prmdata[8]; 1027 1028 memcpy(prmdata, (void *) skb->data, skb->len); 1029 prmdata[7] = 0xff - (u8) skb->len; 1030 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 1031 (void *) prmdata, 8); 1032 } 1033 1034 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 1035 size_t len) 1036 { 1037 struct sock *sk = sock->sk; 1038 struct iucv_sock *iucv = iucv_sk(sk); 1039 size_t headroom, linear; 1040 struct sk_buff *skb; 1041 struct iucv_message txmsg = {0}; 1042 struct cmsghdr *cmsg; 1043 int cmsg_done; 1044 long timeo; 1045 char user_id[9]; 1046 char appl_id[9]; 1047 int err; 1048 int noblock = msg->msg_flags & MSG_DONTWAIT; 1049 1050 err = sock_error(sk); 1051 if (err) 1052 return err; 1053 1054 if (msg->msg_flags & MSG_OOB) 1055 return -EOPNOTSUPP; 1056 1057 /* SOCK_SEQPACKET: we do not support segmented records */ 1058 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 1059 return -EOPNOTSUPP; 1060 1061 lock_sock(sk); 1062 1063 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1064 err = -EPIPE; 1065 goto out; 1066 } 1067 1068 /* Return if the socket is not in connected state */ 1069 if (sk->sk_state != IUCV_CONNECTED) { 1070 err = -ENOTCONN; 1071 goto out; 1072 } 1073 1074 /* initialize defaults */ 1075 cmsg_done = 0; /* check for duplicate headers */ 1076 txmsg.class = 0; 1077 1078 /* iterate over control messages */ 1079 for_each_cmsghdr(cmsg, msg) { 1080 if (!CMSG_OK(msg, cmsg)) { 1081 err = -EINVAL; 1082 goto out; 1083 } 1084 1085 if (cmsg->cmsg_level != SOL_IUCV) 1086 continue; 1087 1088 if (cmsg->cmsg_type & cmsg_done) { 1089 err = -EINVAL; 1090 goto out; 1091 } 1092 cmsg_done |= cmsg->cmsg_type; 1093 1094 switch (cmsg->cmsg_type) { 1095 case SCM_IUCV_TRGCLS: 1096 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 1097 err = -EINVAL; 1098 goto out; 1099 } 1100 1101 /* set iucv message target class */ 1102 memcpy(&txmsg.class, 1103 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 1104 1105 break; 1106 1107 default: 1108 err = -EINVAL; 1109 goto out; 1110 } 1111 } 1112 1113 /* allocate one skb for each iucv message: 1114 * this is fine for SOCK_SEQPACKET (unless we want to support 1115 * segmented records using the MSG_EOR flag), but 1116 * for SOCK_STREAM we might want to improve it in future */ 1117 headroom = (iucv->transport == AF_IUCV_TRANS_HIPER) 1118 ? sizeof(struct af_iucv_trans_hdr) + ETH_HLEN : 0; 1119 if (headroom + len < PAGE_SIZE) { 1120 linear = len; 1121 } else { 1122 /* In nonlinear "classic" iucv skb, 1123 * reserve space for iucv_array 1124 */ 1125 if (iucv->transport != AF_IUCV_TRANS_HIPER) 1126 headroom += sizeof(struct iucv_array) * 1127 (MAX_SKB_FRAGS + 1); 1128 linear = PAGE_SIZE - headroom; 1129 } 1130 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, 1131 noblock, &err, 0); 1132 if (!skb) 1133 goto out; 1134 if (headroom) 1135 skb_reserve(skb, headroom); 1136 skb_put(skb, linear); 1137 skb->len = len; 1138 skb->data_len = len - linear; 1139 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); 1140 if (err) 1141 goto fail; 1142 1143 /* wait if outstanding messages for iucv path has reached */ 1144 timeo = sock_sndtimeo(sk, noblock); 1145 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1146 if (err) 1147 goto fail; 1148 1149 /* return -ECONNRESET if the socket is no longer connected */ 1150 if (sk->sk_state != IUCV_CONNECTED) { 1151 err = -ECONNRESET; 1152 goto fail; 1153 } 1154 1155 /* increment and save iucv message tag for msg_completion cbk */ 1156 txmsg.tag = iucv->send_tag++; 1157 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1158 1159 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1160 atomic_inc(&iucv->msg_sent); 1161 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1162 if (err) { 1163 atomic_dec(&iucv->msg_sent); 1164 goto fail; 1165 } 1166 } else { /* Classic VM IUCV transport */ 1167 skb_queue_tail(&iucv->send_skb_q, skb); 1168 1169 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && 1170 skb->len <= 7) { 1171 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1172 1173 /* on success: there is no message_complete callback */ 1174 /* for an IPRMDATA msg; remove skb from send queue */ 1175 if (err == 0) { 1176 skb_unlink(skb, &iucv->send_skb_q); 1177 kfree_skb(skb); 1178 } 1179 1180 /* this error should never happen since the */ 1181 /* IUCV_IPRMDATA path flag is set... sever path */ 1182 if (err == 0x15) { 1183 pr_iucv->path_sever(iucv->path, NULL); 1184 skb_unlink(skb, &iucv->send_skb_q); 1185 err = -EPIPE; 1186 goto fail; 1187 } 1188 } else if (skb_is_nonlinear(skb)) { 1189 struct iucv_array *iba = (struct iucv_array *)skb->head; 1190 int i; 1191 1192 /* skip iucv_array lying in the headroom */ 1193 iba[0].address = (u32)(addr_t)skb->data; 1194 iba[0].length = (u32)skb_headlen(skb); 1195 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1196 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1197 1198 iba[i + 1].address = 1199 (u32)(addr_t)skb_frag_address(frag); 1200 iba[i + 1].length = (u32)skb_frag_size(frag); 1201 } 1202 err = pr_iucv->message_send(iucv->path, &txmsg, 1203 IUCV_IPBUFLST, 0, 1204 (void *)iba, skb->len); 1205 } else { /* non-IPRM Linear skb */ 1206 err = pr_iucv->message_send(iucv->path, &txmsg, 1207 0, 0, (void *)skb->data, skb->len); 1208 } 1209 if (err) { 1210 if (err == 3) { 1211 user_id[8] = 0; 1212 memcpy(user_id, iucv->dst_user_id, 8); 1213 appl_id[8] = 0; 1214 memcpy(appl_id, iucv->dst_name, 8); 1215 pr_err( 1216 "Application %s on z/VM guest %s exceeds message limit\n", 1217 appl_id, user_id); 1218 err = -EAGAIN; 1219 } else { 1220 err = -EPIPE; 1221 } 1222 skb_unlink(skb, &iucv->send_skb_q); 1223 goto fail; 1224 } 1225 } 1226 1227 release_sock(sk); 1228 return len; 1229 1230 fail: 1231 kfree_skb(skb); 1232 out: 1233 release_sock(sk); 1234 return err; 1235 } 1236 1237 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) 1238 { 1239 size_t headroom, linear; 1240 struct sk_buff *skb; 1241 int err; 1242 1243 if (len < PAGE_SIZE) { 1244 headroom = 0; 1245 linear = len; 1246 } else { 1247 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); 1248 linear = PAGE_SIZE - headroom; 1249 } 1250 skb = alloc_skb_with_frags(headroom + linear, len - linear, 1251 0, &err, GFP_ATOMIC | GFP_DMA); 1252 WARN_ONCE(!skb, 1253 "alloc of recv iucv skb len=%lu failed with errcode=%d\n", 1254 len, err); 1255 if (skb) { 1256 if (headroom) 1257 skb_reserve(skb, headroom); 1258 skb_put(skb, linear); 1259 skb->len = len; 1260 skb->data_len = len - linear; 1261 } 1262 return skb; 1263 } 1264 1265 /* iucv_process_message() - Receive a single outstanding IUCV message 1266 * 1267 * Locking: must be called with message_q.lock held 1268 */ 1269 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1270 struct iucv_path *path, 1271 struct iucv_message *msg) 1272 { 1273 int rc; 1274 unsigned int len; 1275 1276 len = iucv_msg_length(msg); 1277 1278 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1279 /* Note: the first 4 bytes are reserved for msg tag */ 1280 IUCV_SKB_CB(skb)->class = msg->class; 1281 1282 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1283 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1284 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1285 skb->data = NULL; 1286 skb->len = 0; 1287 } 1288 } else { 1289 if (skb_is_nonlinear(skb)) { 1290 struct iucv_array *iba = (struct iucv_array *)skb->head; 1291 int i; 1292 1293 iba[0].address = (u32)(addr_t)skb->data; 1294 iba[0].length = (u32)skb_headlen(skb); 1295 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1296 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1297 1298 iba[i + 1].address = 1299 (u32)(addr_t)skb_frag_address(frag); 1300 iba[i + 1].length = (u32)skb_frag_size(frag); 1301 } 1302 rc = pr_iucv->message_receive(path, msg, 1303 IUCV_IPBUFLST, 1304 (void *)iba, len, NULL); 1305 } else { 1306 rc = pr_iucv->message_receive(path, msg, 1307 msg->flags & IUCV_IPRMDATA, 1308 skb->data, len, NULL); 1309 } 1310 if (rc) { 1311 kfree_skb(skb); 1312 return; 1313 } 1314 WARN_ON_ONCE(skb->len != len); 1315 } 1316 1317 IUCV_SKB_CB(skb)->offset = 0; 1318 if (sock_queue_rcv_skb(sk, skb)) 1319 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); 1320 } 1321 1322 /* iucv_process_message_q() - Process outstanding IUCV messages 1323 * 1324 * Locking: must be called with message_q.lock held 1325 */ 1326 static void iucv_process_message_q(struct sock *sk) 1327 { 1328 struct iucv_sock *iucv = iucv_sk(sk); 1329 struct sk_buff *skb; 1330 struct sock_msg_q *p, *n; 1331 1332 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1333 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); 1334 if (!skb) 1335 break; 1336 iucv_process_message(sk, skb, p->path, &p->msg); 1337 list_del(&p->list); 1338 kfree(p); 1339 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1340 break; 1341 } 1342 } 1343 1344 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1345 size_t len, int flags) 1346 { 1347 int noblock = flags & MSG_DONTWAIT; 1348 struct sock *sk = sock->sk; 1349 struct iucv_sock *iucv = iucv_sk(sk); 1350 unsigned int copied, rlen; 1351 struct sk_buff *skb, *rskb, *cskb; 1352 int err = 0; 1353 u32 offset; 1354 1355 if ((sk->sk_state == IUCV_DISCONN) && 1356 skb_queue_empty(&iucv->backlog_skb_q) && 1357 skb_queue_empty(&sk->sk_receive_queue) && 1358 list_empty(&iucv->message_q.list)) 1359 return 0; 1360 1361 if (flags & (MSG_OOB)) 1362 return -EOPNOTSUPP; 1363 1364 /* receive/dequeue next skb: 1365 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1366 skb = skb_recv_datagram(sk, flags, noblock, &err); 1367 if (!skb) { 1368 if (sk->sk_shutdown & RCV_SHUTDOWN) 1369 return 0; 1370 return err; 1371 } 1372 1373 offset = IUCV_SKB_CB(skb)->offset; 1374 rlen = skb->len - offset; /* real length of skb */ 1375 copied = min_t(unsigned int, rlen, len); 1376 if (!rlen) 1377 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1378 1379 cskb = skb; 1380 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1381 if (!(flags & MSG_PEEK)) 1382 skb_queue_head(&sk->sk_receive_queue, skb); 1383 return -EFAULT; 1384 } 1385 1386 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1387 if (sk->sk_type == SOCK_SEQPACKET) { 1388 if (copied < rlen) 1389 msg->msg_flags |= MSG_TRUNC; 1390 /* each iucv message contains a complete record */ 1391 msg->msg_flags |= MSG_EOR; 1392 } 1393 1394 /* create control message to store iucv msg target class: 1395 * get the trgcls from the control buffer of the skb due to 1396 * fragmentation of original iucv message. */ 1397 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1398 sizeof(IUCV_SKB_CB(skb)->class), 1399 (void *)&IUCV_SKB_CB(skb)->class); 1400 if (err) { 1401 if (!(flags & MSG_PEEK)) 1402 skb_queue_head(&sk->sk_receive_queue, skb); 1403 return err; 1404 } 1405 1406 /* Mark read part of skb as used */ 1407 if (!(flags & MSG_PEEK)) { 1408 1409 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1410 if (sk->sk_type == SOCK_STREAM) { 1411 if (copied < rlen) { 1412 IUCV_SKB_CB(skb)->offset = offset + copied; 1413 skb_queue_head(&sk->sk_receive_queue, skb); 1414 goto done; 1415 } 1416 } 1417 1418 kfree_skb(skb); 1419 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1420 atomic_inc(&iucv->msg_recv); 1421 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1422 WARN_ON(1); 1423 iucv_sock_close(sk); 1424 return -EFAULT; 1425 } 1426 } 1427 1428 /* Queue backlog skbs */ 1429 spin_lock_bh(&iucv->message_q.lock); 1430 rskb = skb_dequeue(&iucv->backlog_skb_q); 1431 while (rskb) { 1432 IUCV_SKB_CB(rskb)->offset = 0; 1433 if (sock_queue_rcv_skb(sk, rskb)) { 1434 skb_queue_head(&iucv->backlog_skb_q, 1435 rskb); 1436 break; 1437 } else { 1438 rskb = skb_dequeue(&iucv->backlog_skb_q); 1439 } 1440 } 1441 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1442 if (!list_empty(&iucv->message_q.list)) 1443 iucv_process_message_q(sk); 1444 if (atomic_read(&iucv->msg_recv) >= 1445 iucv->msglimit / 2) { 1446 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1447 if (err) { 1448 sk->sk_state = IUCV_DISCONN; 1449 sk->sk_state_change(sk); 1450 } 1451 } 1452 } 1453 spin_unlock_bh(&iucv->message_q.lock); 1454 } 1455 1456 done: 1457 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1458 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1459 copied = rlen; 1460 1461 return copied; 1462 } 1463 1464 static inline unsigned int iucv_accept_poll(struct sock *parent) 1465 { 1466 struct iucv_sock *isk, *n; 1467 struct sock *sk; 1468 1469 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1470 sk = (struct sock *) isk; 1471 1472 if (sk->sk_state == IUCV_CONNECTED) 1473 return POLLIN | POLLRDNORM; 1474 } 1475 1476 return 0; 1477 } 1478 1479 unsigned int iucv_sock_poll(struct file *file, struct socket *sock, 1480 poll_table *wait) 1481 { 1482 struct sock *sk = sock->sk; 1483 unsigned int mask = 0; 1484 1485 sock_poll_wait(file, sk_sleep(sk), wait); 1486 1487 if (sk->sk_state == IUCV_LISTEN) 1488 return iucv_accept_poll(sk); 1489 1490 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1491 mask |= POLLERR | 1492 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); 1493 1494 if (sk->sk_shutdown & RCV_SHUTDOWN) 1495 mask |= POLLRDHUP; 1496 1497 if (sk->sk_shutdown == SHUTDOWN_MASK) 1498 mask |= POLLHUP; 1499 1500 if (!skb_queue_empty(&sk->sk_receive_queue) || 1501 (sk->sk_shutdown & RCV_SHUTDOWN)) 1502 mask |= POLLIN | POLLRDNORM; 1503 1504 if (sk->sk_state == IUCV_CLOSED) 1505 mask |= POLLHUP; 1506 1507 if (sk->sk_state == IUCV_DISCONN) 1508 mask |= POLLIN; 1509 1510 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1511 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 1512 else 1513 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1514 1515 return mask; 1516 } 1517 1518 static int iucv_sock_shutdown(struct socket *sock, int how) 1519 { 1520 struct sock *sk = sock->sk; 1521 struct iucv_sock *iucv = iucv_sk(sk); 1522 struct iucv_message txmsg; 1523 int err = 0; 1524 1525 how++; 1526 1527 if ((how & ~SHUTDOWN_MASK) || !how) 1528 return -EINVAL; 1529 1530 lock_sock(sk); 1531 switch (sk->sk_state) { 1532 case IUCV_LISTEN: 1533 case IUCV_DISCONN: 1534 case IUCV_CLOSING: 1535 case IUCV_CLOSED: 1536 err = -ENOTCONN; 1537 goto fail; 1538 default: 1539 break; 1540 } 1541 1542 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1543 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1544 txmsg.class = 0; 1545 txmsg.tag = 0; 1546 err = pr_iucv->message_send(iucv->path, &txmsg, 1547 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1548 if (err) { 1549 switch (err) { 1550 case 1: 1551 err = -ENOTCONN; 1552 break; 1553 case 2: 1554 err = -ECONNRESET; 1555 break; 1556 default: 1557 err = -ENOTCONN; 1558 break; 1559 } 1560 } 1561 } else 1562 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1563 } 1564 1565 sk->sk_shutdown |= how; 1566 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1567 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1568 iucv->path) { 1569 err = pr_iucv->path_quiesce(iucv->path, NULL); 1570 if (err) 1571 err = -ENOTCONN; 1572 /* skb_queue_purge(&sk->sk_receive_queue); */ 1573 } 1574 skb_queue_purge(&sk->sk_receive_queue); 1575 } 1576 1577 /* Wake up anyone sleeping in poll */ 1578 sk->sk_state_change(sk); 1579 1580 fail: 1581 release_sock(sk); 1582 return err; 1583 } 1584 1585 static int iucv_sock_release(struct socket *sock) 1586 { 1587 struct sock *sk = sock->sk; 1588 int err = 0; 1589 1590 if (!sk) 1591 return 0; 1592 1593 iucv_sock_close(sk); 1594 1595 sock_orphan(sk); 1596 iucv_sock_kill(sk); 1597 return err; 1598 } 1599 1600 /* getsockopt and setsockopt */ 1601 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1602 char __user *optval, unsigned int optlen) 1603 { 1604 struct sock *sk = sock->sk; 1605 struct iucv_sock *iucv = iucv_sk(sk); 1606 int val; 1607 int rc; 1608 1609 if (level != SOL_IUCV) 1610 return -ENOPROTOOPT; 1611 1612 if (optlen < sizeof(int)) 1613 return -EINVAL; 1614 1615 if (get_user(val, (int __user *) optval)) 1616 return -EFAULT; 1617 1618 rc = 0; 1619 1620 lock_sock(sk); 1621 switch (optname) { 1622 case SO_IPRMDATA_MSG: 1623 if (val) 1624 iucv->flags |= IUCV_IPRMDATA; 1625 else 1626 iucv->flags &= ~IUCV_IPRMDATA; 1627 break; 1628 case SO_MSGLIMIT: 1629 switch (sk->sk_state) { 1630 case IUCV_OPEN: 1631 case IUCV_BOUND: 1632 if (val < 1 || val > (u16)(~0)) 1633 rc = -EINVAL; 1634 else 1635 iucv->msglimit = val; 1636 break; 1637 default: 1638 rc = -EINVAL; 1639 break; 1640 } 1641 break; 1642 default: 1643 rc = -ENOPROTOOPT; 1644 break; 1645 } 1646 release_sock(sk); 1647 1648 return rc; 1649 } 1650 1651 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1652 char __user *optval, int __user *optlen) 1653 { 1654 struct sock *sk = sock->sk; 1655 struct iucv_sock *iucv = iucv_sk(sk); 1656 unsigned int val; 1657 int len; 1658 1659 if (level != SOL_IUCV) 1660 return -ENOPROTOOPT; 1661 1662 if (get_user(len, optlen)) 1663 return -EFAULT; 1664 1665 if (len < 0) 1666 return -EINVAL; 1667 1668 len = min_t(unsigned int, len, sizeof(int)); 1669 1670 switch (optname) { 1671 case SO_IPRMDATA_MSG: 1672 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1673 break; 1674 case SO_MSGLIMIT: 1675 lock_sock(sk); 1676 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1677 : iucv->msglimit; /* default */ 1678 release_sock(sk); 1679 break; 1680 case SO_MSGSIZE: 1681 if (sk->sk_state == IUCV_OPEN) 1682 return -EBADFD; 1683 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1684 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1685 0x7fffffff; 1686 break; 1687 default: 1688 return -ENOPROTOOPT; 1689 } 1690 1691 if (put_user(len, optlen)) 1692 return -EFAULT; 1693 if (copy_to_user(optval, &val, len)) 1694 return -EFAULT; 1695 1696 return 0; 1697 } 1698 1699 1700 /* Callback wrappers - called from iucv base support */ 1701 static int iucv_callback_connreq(struct iucv_path *path, 1702 u8 ipvmid[8], u8 ipuser[16]) 1703 { 1704 unsigned char user_data[16]; 1705 unsigned char nuser_data[16]; 1706 unsigned char src_name[8]; 1707 struct sock *sk, *nsk; 1708 struct iucv_sock *iucv, *niucv; 1709 int err; 1710 1711 memcpy(src_name, ipuser, 8); 1712 EBCASC(src_name, 8); 1713 /* Find out if this path belongs to af_iucv. */ 1714 read_lock(&iucv_sk_list.lock); 1715 iucv = NULL; 1716 sk = NULL; 1717 sk_for_each(sk, &iucv_sk_list.head) 1718 if (sk->sk_state == IUCV_LISTEN && 1719 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1720 /* 1721 * Found a listening socket with 1722 * src_name == ipuser[0-7]. 1723 */ 1724 iucv = iucv_sk(sk); 1725 break; 1726 } 1727 read_unlock(&iucv_sk_list.lock); 1728 if (!iucv) 1729 /* No socket found, not one of our paths. */ 1730 return -EINVAL; 1731 1732 bh_lock_sock(sk); 1733 1734 /* Check if parent socket is listening */ 1735 low_nmcpy(user_data, iucv->src_name); 1736 high_nmcpy(user_data, iucv->dst_name); 1737 ASCEBC(user_data, sizeof(user_data)); 1738 if (sk->sk_state != IUCV_LISTEN) { 1739 err = pr_iucv->path_sever(path, user_data); 1740 iucv_path_free(path); 1741 goto fail; 1742 } 1743 1744 /* Check for backlog size */ 1745 if (sk_acceptq_is_full(sk)) { 1746 err = pr_iucv->path_sever(path, user_data); 1747 iucv_path_free(path); 1748 goto fail; 1749 } 1750 1751 /* Create the new socket */ 1752 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1753 if (!nsk) { 1754 err = pr_iucv->path_sever(path, user_data); 1755 iucv_path_free(path); 1756 goto fail; 1757 } 1758 1759 niucv = iucv_sk(nsk); 1760 iucv_sock_init(nsk, sk); 1761 1762 /* Set the new iucv_sock */ 1763 memcpy(niucv->dst_name, ipuser + 8, 8); 1764 EBCASC(niucv->dst_name, 8); 1765 memcpy(niucv->dst_user_id, ipvmid, 8); 1766 memcpy(niucv->src_name, iucv->src_name, 8); 1767 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1768 niucv->path = path; 1769 1770 /* Call iucv_accept */ 1771 high_nmcpy(nuser_data, ipuser + 8); 1772 memcpy(nuser_data + 8, niucv->src_name, 8); 1773 ASCEBC(nuser_data + 8, 8); 1774 1775 /* set message limit for path based on msglimit of accepting socket */ 1776 niucv->msglimit = iucv->msglimit; 1777 path->msglim = iucv->msglimit; 1778 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1779 if (err) { 1780 iucv_sever_path(nsk, 1); 1781 iucv_sock_kill(nsk); 1782 goto fail; 1783 } 1784 1785 iucv_accept_enqueue(sk, nsk); 1786 1787 /* Wake up accept */ 1788 nsk->sk_state = IUCV_CONNECTED; 1789 sk->sk_data_ready(sk); 1790 err = 0; 1791 fail: 1792 bh_unlock_sock(sk); 1793 return 0; 1794 } 1795 1796 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1797 { 1798 struct sock *sk = path->private; 1799 1800 sk->sk_state = IUCV_CONNECTED; 1801 sk->sk_state_change(sk); 1802 } 1803 1804 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1805 { 1806 struct sock *sk = path->private; 1807 struct iucv_sock *iucv = iucv_sk(sk); 1808 struct sk_buff *skb; 1809 struct sock_msg_q *save_msg; 1810 int len; 1811 1812 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1813 pr_iucv->message_reject(path, msg); 1814 return; 1815 } 1816 1817 spin_lock(&iucv->message_q.lock); 1818 1819 if (!list_empty(&iucv->message_q.list) || 1820 !skb_queue_empty(&iucv->backlog_skb_q)) 1821 goto save_message; 1822 1823 len = atomic_read(&sk->sk_rmem_alloc); 1824 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1825 if (len > sk->sk_rcvbuf) 1826 goto save_message; 1827 1828 skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); 1829 if (!skb) 1830 goto save_message; 1831 1832 iucv_process_message(sk, skb, path, msg); 1833 goto out_unlock; 1834 1835 save_message: 1836 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1837 if (!save_msg) 1838 goto out_unlock; 1839 save_msg->path = path; 1840 save_msg->msg = *msg; 1841 1842 list_add_tail(&save_msg->list, &iucv->message_q.list); 1843 1844 out_unlock: 1845 spin_unlock(&iucv->message_q.lock); 1846 } 1847 1848 static void iucv_callback_txdone(struct iucv_path *path, 1849 struct iucv_message *msg) 1850 { 1851 struct sock *sk = path->private; 1852 struct sk_buff *this = NULL; 1853 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1854 struct sk_buff *list_skb = list->next; 1855 unsigned long flags; 1856 1857 bh_lock_sock(sk); 1858 if (!skb_queue_empty(list)) { 1859 spin_lock_irqsave(&list->lock, flags); 1860 1861 while (list_skb != (struct sk_buff *)list) { 1862 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1863 this = list_skb; 1864 break; 1865 } 1866 list_skb = list_skb->next; 1867 } 1868 if (this) 1869 __skb_unlink(this, list); 1870 1871 spin_unlock_irqrestore(&list->lock, flags); 1872 1873 if (this) { 1874 kfree_skb(this); 1875 /* wake up any process waiting for sending */ 1876 iucv_sock_wake_msglim(sk); 1877 } 1878 } 1879 1880 if (sk->sk_state == IUCV_CLOSING) { 1881 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1882 sk->sk_state = IUCV_CLOSED; 1883 sk->sk_state_change(sk); 1884 } 1885 } 1886 bh_unlock_sock(sk); 1887 1888 } 1889 1890 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1891 { 1892 struct sock *sk = path->private; 1893 1894 if (sk->sk_state == IUCV_CLOSED) 1895 return; 1896 1897 bh_lock_sock(sk); 1898 iucv_sever_path(sk, 1); 1899 sk->sk_state = IUCV_DISCONN; 1900 1901 sk->sk_state_change(sk); 1902 bh_unlock_sock(sk); 1903 } 1904 1905 /* called if the other communication side shuts down its RECV direction; 1906 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1907 */ 1908 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1909 { 1910 struct sock *sk = path->private; 1911 1912 bh_lock_sock(sk); 1913 if (sk->sk_state != IUCV_CLOSED) { 1914 sk->sk_shutdown |= SEND_SHUTDOWN; 1915 sk->sk_state_change(sk); 1916 } 1917 bh_unlock_sock(sk); 1918 } 1919 1920 /***************** HiperSockets transport callbacks ********************/ 1921 static void afiucv_swap_src_dest(struct sk_buff *skb) 1922 { 1923 struct af_iucv_trans_hdr *trans_hdr = 1924 (struct af_iucv_trans_hdr *)skb->data; 1925 char tmpID[8]; 1926 char tmpName[8]; 1927 1928 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1929 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1930 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1931 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1932 memcpy(tmpID, trans_hdr->srcUserID, 8); 1933 memcpy(tmpName, trans_hdr->srcAppName, 8); 1934 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1935 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1936 memcpy(trans_hdr->destUserID, tmpID, 8); 1937 memcpy(trans_hdr->destAppName, tmpName, 8); 1938 skb_push(skb, ETH_HLEN); 1939 memset(skb->data, 0, ETH_HLEN); 1940 } 1941 1942 /** 1943 * afiucv_hs_callback_syn - react on received SYN 1944 **/ 1945 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1946 { 1947 struct sock *nsk; 1948 struct iucv_sock *iucv, *niucv; 1949 struct af_iucv_trans_hdr *trans_hdr; 1950 int err; 1951 1952 iucv = iucv_sk(sk); 1953 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 1954 if (!iucv) { 1955 /* no sock - connection refused */ 1956 afiucv_swap_src_dest(skb); 1957 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1958 err = dev_queue_xmit(skb); 1959 goto out; 1960 } 1961 1962 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1963 bh_lock_sock(sk); 1964 if ((sk->sk_state != IUCV_LISTEN) || 1965 sk_acceptq_is_full(sk) || 1966 !nsk) { 1967 /* error on server socket - connection refused */ 1968 afiucv_swap_src_dest(skb); 1969 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1970 err = dev_queue_xmit(skb); 1971 iucv_sock_kill(nsk); 1972 bh_unlock_sock(sk); 1973 goto out; 1974 } 1975 1976 niucv = iucv_sk(nsk); 1977 iucv_sock_init(nsk, sk); 1978 niucv->transport = AF_IUCV_TRANS_HIPER; 1979 niucv->msglimit = iucv->msglimit; 1980 if (!trans_hdr->window) 1981 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1982 else 1983 niucv->msglimit_peer = trans_hdr->window; 1984 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 1985 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 1986 memcpy(niucv->src_name, iucv->src_name, 8); 1987 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1988 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 1989 niucv->hs_dev = iucv->hs_dev; 1990 dev_hold(niucv->hs_dev); 1991 afiucv_swap_src_dest(skb); 1992 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 1993 trans_hdr->window = niucv->msglimit; 1994 /* if receiver acks the xmit connection is established */ 1995 err = dev_queue_xmit(skb); 1996 if (!err) { 1997 iucv_accept_enqueue(sk, nsk); 1998 nsk->sk_state = IUCV_CONNECTED; 1999 sk->sk_data_ready(sk); 2000 } else 2001 iucv_sock_kill(nsk); 2002 bh_unlock_sock(sk); 2003 2004 out: 2005 return NET_RX_SUCCESS; 2006 } 2007 2008 /** 2009 * afiucv_hs_callback_synack() - react on received SYN-ACK 2010 **/ 2011 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 2012 { 2013 struct iucv_sock *iucv = iucv_sk(sk); 2014 struct af_iucv_trans_hdr *trans_hdr = 2015 (struct af_iucv_trans_hdr *)skb->data; 2016 2017 if (!iucv) 2018 goto out; 2019 if (sk->sk_state != IUCV_BOUND) 2020 goto out; 2021 bh_lock_sock(sk); 2022 iucv->msglimit_peer = trans_hdr->window; 2023 sk->sk_state = IUCV_CONNECTED; 2024 sk->sk_state_change(sk); 2025 bh_unlock_sock(sk); 2026 out: 2027 kfree_skb(skb); 2028 return NET_RX_SUCCESS; 2029 } 2030 2031 /** 2032 * afiucv_hs_callback_synfin() - react on received SYN_FIN 2033 **/ 2034 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 2035 { 2036 struct iucv_sock *iucv = iucv_sk(sk); 2037 2038 if (!iucv) 2039 goto out; 2040 if (sk->sk_state != IUCV_BOUND) 2041 goto out; 2042 bh_lock_sock(sk); 2043 sk->sk_state = IUCV_DISCONN; 2044 sk->sk_state_change(sk); 2045 bh_unlock_sock(sk); 2046 out: 2047 kfree_skb(skb); 2048 return NET_RX_SUCCESS; 2049 } 2050 2051 /** 2052 * afiucv_hs_callback_fin() - react on received FIN 2053 **/ 2054 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 2055 { 2056 struct iucv_sock *iucv = iucv_sk(sk); 2057 2058 /* other end of connection closed */ 2059 if (!iucv) 2060 goto out; 2061 bh_lock_sock(sk); 2062 if (sk->sk_state == IUCV_CONNECTED) { 2063 sk->sk_state = IUCV_DISCONN; 2064 sk->sk_state_change(sk); 2065 } 2066 bh_unlock_sock(sk); 2067 out: 2068 kfree_skb(skb); 2069 return NET_RX_SUCCESS; 2070 } 2071 2072 /** 2073 * afiucv_hs_callback_win() - react on received WIN 2074 **/ 2075 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2076 { 2077 struct iucv_sock *iucv = iucv_sk(sk); 2078 struct af_iucv_trans_hdr *trans_hdr = 2079 (struct af_iucv_trans_hdr *)skb->data; 2080 2081 if (!iucv) 2082 return NET_RX_SUCCESS; 2083 2084 if (sk->sk_state != IUCV_CONNECTED) 2085 return NET_RX_SUCCESS; 2086 2087 atomic_sub(trans_hdr->window, &iucv->msg_sent); 2088 iucv_sock_wake_msglim(sk); 2089 return NET_RX_SUCCESS; 2090 } 2091 2092 /** 2093 * afiucv_hs_callback_rx() - react on received data 2094 **/ 2095 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2096 { 2097 struct iucv_sock *iucv = iucv_sk(sk); 2098 2099 if (!iucv) { 2100 kfree_skb(skb); 2101 return NET_RX_SUCCESS; 2102 } 2103 2104 if (sk->sk_state != IUCV_CONNECTED) { 2105 kfree_skb(skb); 2106 return NET_RX_SUCCESS; 2107 } 2108 2109 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2110 kfree_skb(skb); 2111 return NET_RX_SUCCESS; 2112 } 2113 2114 /* write stuff from iucv_msg to skb cb */ 2115 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2116 skb_reset_transport_header(skb); 2117 skb_reset_network_header(skb); 2118 IUCV_SKB_CB(skb)->offset = 0; 2119 spin_lock(&iucv->message_q.lock); 2120 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2121 if (sock_queue_rcv_skb(sk, skb)) { 2122 /* handle rcv queue full */ 2123 skb_queue_tail(&iucv->backlog_skb_q, skb); 2124 } 2125 } else 2126 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2127 spin_unlock(&iucv->message_q.lock); 2128 return NET_RX_SUCCESS; 2129 } 2130 2131 /** 2132 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2133 * transport 2134 * called from netif RX softirq 2135 **/ 2136 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2137 struct packet_type *pt, struct net_device *orig_dev) 2138 { 2139 struct sock *sk; 2140 struct iucv_sock *iucv; 2141 struct af_iucv_trans_hdr *trans_hdr; 2142 char nullstring[8]; 2143 int err = 0; 2144 2145 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) { 2146 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d", 2147 (int)skb->len, 2148 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr))); 2149 kfree_skb(skb); 2150 return NET_RX_SUCCESS; 2151 } 2152 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) 2153 if (skb_linearize(skb)) { 2154 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d", 2155 (int)skb->len); 2156 kfree_skb(skb); 2157 return NET_RX_SUCCESS; 2158 } 2159 skb_pull(skb, ETH_HLEN); 2160 trans_hdr = (struct af_iucv_trans_hdr *)skb->data; 2161 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2162 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2163 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2164 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2165 memset(nullstring, 0, sizeof(nullstring)); 2166 iucv = NULL; 2167 sk = NULL; 2168 read_lock(&iucv_sk_list.lock); 2169 sk_for_each(sk, &iucv_sk_list.head) { 2170 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2171 if ((!memcmp(&iucv_sk(sk)->src_name, 2172 trans_hdr->destAppName, 8)) && 2173 (!memcmp(&iucv_sk(sk)->src_user_id, 2174 trans_hdr->destUserID, 8)) && 2175 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2176 (!memcmp(&iucv_sk(sk)->dst_user_id, 2177 nullstring, 8))) { 2178 iucv = iucv_sk(sk); 2179 break; 2180 } 2181 } else { 2182 if ((!memcmp(&iucv_sk(sk)->src_name, 2183 trans_hdr->destAppName, 8)) && 2184 (!memcmp(&iucv_sk(sk)->src_user_id, 2185 trans_hdr->destUserID, 8)) && 2186 (!memcmp(&iucv_sk(sk)->dst_name, 2187 trans_hdr->srcAppName, 8)) && 2188 (!memcmp(&iucv_sk(sk)->dst_user_id, 2189 trans_hdr->srcUserID, 8))) { 2190 iucv = iucv_sk(sk); 2191 break; 2192 } 2193 } 2194 } 2195 read_unlock(&iucv_sk_list.lock); 2196 if (!iucv) 2197 sk = NULL; 2198 2199 /* no sock 2200 how should we send with no sock 2201 1) send without sock no send rc checking? 2202 2) introduce default sock to handle this cases 2203 2204 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2205 data -> send FIN 2206 SYN|ACK, SYN|FIN, FIN -> no action? */ 2207 2208 switch (trans_hdr->flags) { 2209 case AF_IUCV_FLAG_SYN: 2210 /* connect request */ 2211 err = afiucv_hs_callback_syn(sk, skb); 2212 break; 2213 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2214 /* connect request confirmed */ 2215 err = afiucv_hs_callback_synack(sk, skb); 2216 break; 2217 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2218 /* connect request refused */ 2219 err = afiucv_hs_callback_synfin(sk, skb); 2220 break; 2221 case (AF_IUCV_FLAG_FIN): 2222 /* close request */ 2223 err = afiucv_hs_callback_fin(sk, skb); 2224 break; 2225 case (AF_IUCV_FLAG_WIN): 2226 err = afiucv_hs_callback_win(sk, skb); 2227 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2228 kfree_skb(skb); 2229 break; 2230 } 2231 /* fall through and receive non-zero length data */ 2232 case (AF_IUCV_FLAG_SHT): 2233 /* shutdown request */ 2234 /* fall through and receive zero length data */ 2235 case 0: 2236 /* plain data frame */ 2237 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2238 err = afiucv_hs_callback_rx(sk, skb); 2239 break; 2240 default: 2241 ; 2242 } 2243 2244 return err; 2245 } 2246 2247 /** 2248 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2249 * transport 2250 **/ 2251 static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2252 enum iucv_tx_notify n) 2253 { 2254 struct sock *isk = skb->sk; 2255 struct sock *sk = NULL; 2256 struct iucv_sock *iucv = NULL; 2257 struct sk_buff_head *list; 2258 struct sk_buff *list_skb; 2259 struct sk_buff *nskb; 2260 unsigned long flags; 2261 2262 read_lock_irqsave(&iucv_sk_list.lock, flags); 2263 sk_for_each(sk, &iucv_sk_list.head) 2264 if (sk == isk) { 2265 iucv = iucv_sk(sk); 2266 break; 2267 } 2268 read_unlock_irqrestore(&iucv_sk_list.lock, flags); 2269 2270 if (!iucv || sock_flag(sk, SOCK_ZAPPED)) 2271 return; 2272 2273 list = &iucv->send_skb_q; 2274 spin_lock_irqsave(&list->lock, flags); 2275 if (skb_queue_empty(list)) 2276 goto out_unlock; 2277 list_skb = list->next; 2278 nskb = list_skb->next; 2279 while (list_skb != (struct sk_buff *)list) { 2280 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2281 switch (n) { 2282 case TX_NOTIFY_OK: 2283 __skb_unlink(list_skb, list); 2284 kfree_skb(list_skb); 2285 iucv_sock_wake_msglim(sk); 2286 break; 2287 case TX_NOTIFY_PENDING: 2288 atomic_inc(&iucv->pendings); 2289 break; 2290 case TX_NOTIFY_DELAYED_OK: 2291 __skb_unlink(list_skb, list); 2292 atomic_dec(&iucv->pendings); 2293 if (atomic_read(&iucv->pendings) <= 0) 2294 iucv_sock_wake_msglim(sk); 2295 kfree_skb(list_skb); 2296 break; 2297 case TX_NOTIFY_UNREACHABLE: 2298 case TX_NOTIFY_DELAYED_UNREACHABLE: 2299 case TX_NOTIFY_TPQFULL: /* not yet used */ 2300 case TX_NOTIFY_GENERALERROR: 2301 case TX_NOTIFY_DELAYED_GENERALERROR: 2302 __skb_unlink(list_skb, list); 2303 kfree_skb(list_skb); 2304 if (sk->sk_state == IUCV_CONNECTED) { 2305 sk->sk_state = IUCV_DISCONN; 2306 sk->sk_state_change(sk); 2307 } 2308 break; 2309 } 2310 break; 2311 } 2312 list_skb = nskb; 2313 nskb = nskb->next; 2314 } 2315 out_unlock: 2316 spin_unlock_irqrestore(&list->lock, flags); 2317 2318 if (sk->sk_state == IUCV_CLOSING) { 2319 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2320 sk->sk_state = IUCV_CLOSED; 2321 sk->sk_state_change(sk); 2322 } 2323 } 2324 2325 } 2326 2327 /* 2328 * afiucv_netdev_event: handle netdev notifier chain events 2329 */ 2330 static int afiucv_netdev_event(struct notifier_block *this, 2331 unsigned long event, void *ptr) 2332 { 2333 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2334 struct sock *sk; 2335 struct iucv_sock *iucv; 2336 2337 switch (event) { 2338 case NETDEV_REBOOT: 2339 case NETDEV_GOING_DOWN: 2340 sk_for_each(sk, &iucv_sk_list.head) { 2341 iucv = iucv_sk(sk); 2342 if ((iucv->hs_dev == event_dev) && 2343 (sk->sk_state == IUCV_CONNECTED)) { 2344 if (event == NETDEV_GOING_DOWN) 2345 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2346 sk->sk_state = IUCV_DISCONN; 2347 sk->sk_state_change(sk); 2348 } 2349 } 2350 break; 2351 case NETDEV_DOWN: 2352 case NETDEV_UNREGISTER: 2353 default: 2354 break; 2355 } 2356 return NOTIFY_DONE; 2357 } 2358 2359 static struct notifier_block afiucv_netdev_notifier = { 2360 .notifier_call = afiucv_netdev_event, 2361 }; 2362 2363 static const struct proto_ops iucv_sock_ops = { 2364 .family = PF_IUCV, 2365 .owner = THIS_MODULE, 2366 .release = iucv_sock_release, 2367 .bind = iucv_sock_bind, 2368 .connect = iucv_sock_connect, 2369 .listen = iucv_sock_listen, 2370 .accept = iucv_sock_accept, 2371 .getname = iucv_sock_getname, 2372 .sendmsg = iucv_sock_sendmsg, 2373 .recvmsg = iucv_sock_recvmsg, 2374 .poll = iucv_sock_poll, 2375 .ioctl = sock_no_ioctl, 2376 .mmap = sock_no_mmap, 2377 .socketpair = sock_no_socketpair, 2378 .shutdown = iucv_sock_shutdown, 2379 .setsockopt = iucv_sock_setsockopt, 2380 .getsockopt = iucv_sock_getsockopt, 2381 }; 2382 2383 static const struct net_proto_family iucv_sock_family_ops = { 2384 .family = AF_IUCV, 2385 .owner = THIS_MODULE, 2386 .create = iucv_sock_create, 2387 }; 2388 2389 static struct packet_type iucv_packet_type = { 2390 .type = cpu_to_be16(ETH_P_AF_IUCV), 2391 .func = afiucv_hs_rcv, 2392 }; 2393 2394 static int afiucv_iucv_init(void) 2395 { 2396 int err; 2397 2398 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2399 if (err) 2400 goto out; 2401 /* establish dummy device */ 2402 af_iucv_driver.bus = pr_iucv->bus; 2403 err = driver_register(&af_iucv_driver); 2404 if (err) 2405 goto out_iucv; 2406 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 2407 if (!af_iucv_dev) { 2408 err = -ENOMEM; 2409 goto out_driver; 2410 } 2411 dev_set_name(af_iucv_dev, "af_iucv"); 2412 af_iucv_dev->bus = pr_iucv->bus; 2413 af_iucv_dev->parent = pr_iucv->root; 2414 af_iucv_dev->release = (void (*)(struct device *))kfree; 2415 af_iucv_dev->driver = &af_iucv_driver; 2416 err = device_register(af_iucv_dev); 2417 if (err) 2418 goto out_driver; 2419 return 0; 2420 2421 out_driver: 2422 driver_unregister(&af_iucv_driver); 2423 out_iucv: 2424 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2425 out: 2426 return err; 2427 } 2428 2429 static int __init afiucv_init(void) 2430 { 2431 int err; 2432 2433 if (MACHINE_IS_VM) { 2434 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2435 if (unlikely(err)) { 2436 WARN_ON(err); 2437 err = -EPROTONOSUPPORT; 2438 goto out; 2439 } 2440 2441 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2442 if (!pr_iucv) { 2443 printk(KERN_WARNING "iucv_if lookup failed\n"); 2444 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2445 } 2446 } else { 2447 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2448 pr_iucv = NULL; 2449 } 2450 2451 err = proto_register(&iucv_proto, 0); 2452 if (err) 2453 goto out; 2454 err = sock_register(&iucv_sock_family_ops); 2455 if (err) 2456 goto out_proto; 2457 2458 if (pr_iucv) { 2459 err = afiucv_iucv_init(); 2460 if (err) 2461 goto out_sock; 2462 } else 2463 register_netdevice_notifier(&afiucv_netdev_notifier); 2464 dev_add_pack(&iucv_packet_type); 2465 return 0; 2466 2467 out_sock: 2468 sock_unregister(PF_IUCV); 2469 out_proto: 2470 proto_unregister(&iucv_proto); 2471 out: 2472 if (pr_iucv) 2473 symbol_put(iucv_if); 2474 return err; 2475 } 2476 2477 static void __exit afiucv_exit(void) 2478 { 2479 if (pr_iucv) { 2480 device_unregister(af_iucv_dev); 2481 driver_unregister(&af_iucv_driver); 2482 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2483 symbol_put(iucv_if); 2484 } else 2485 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2486 dev_remove_pack(&iucv_packet_type); 2487 sock_unregister(PF_IUCV); 2488 proto_unregister(&iucv_proto); 2489 } 2490 2491 module_init(afiucv_init); 2492 module_exit(afiucv_exit); 2493 2494 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2495 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2496 MODULE_VERSION(VERSION); 2497 MODULE_LICENSE("GPL"); 2498 MODULE_ALIAS_NETPROTO(PF_IUCV); 2499 2500