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